diff --git a/test/functional/feature_assumeutxo.py b/test/functional/feature_assumeutxo.py
index 2680fc4e410..cc0f7fb6e19 100755
--- a/test/functional/feature_assumeutxo.py
+++ b/test/functional/feature_assumeutxo.py
@@ -38,6 +38,7 @@ from test_framework.util import (
     assert_equal,
     assert_not_equal,
     assert_raises_rpc_error,
+    convert_to_json_for_cli,
     ensure_for,
     sha256sum_file,
     try_rpc,
@@ -481,7 +482,7 @@ class AssumeutxoTest(BitcoinTestFramework):
 
         # Use a hash instead of a height
         prev_snap_hash = n0.getblockhash(prev_snap_height)
-        dump_output5 = n0.dumptxoutset('utxos5.dat', rollback=prev_snap_hash)
+        dump_output5 = n0.dumptxoutset('utxos5.dat', rollback=convert_to_json_for_cli(self.options.usecli, prev_snap_hash))
         assert_equal(sha256sum_file(dump_output4['path']), sha256sum_file(dump_output5['path']))
 
         # TODO: This is a hack to set m_best_header to the correct value after
diff --git a/test/functional/feature_coinstatsindex.py b/test/functional/feature_coinstatsindex.py
index a2363c4acfd..457d73f365c 100755
--- a/test/functional/feature_coinstatsindex.py
+++ b/test/functional/feature_coinstatsindex.py
@@ -30,6 +30,7 @@ from test_framework.util import (
     assert_not_equal,
     assert_equal,
     assert_raises_rpc_error,
+    convert_to_json_for_cli,
 )
 from test_framework.wallet import (
     MiniWallet,
@@ -41,7 +42,6 @@ class CoinStatsIndexTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
-        self.supports_cli = False
         self.extra_args = [
             [],
             ["-coinstatsindex"]
@@ -104,7 +104,7 @@ class CoinStatsIndexTest(BitcoinTestFramework):
             assert_equal(res0, res2)
 
             # Fetch old stats by hash
-            res3 = index_node.gettxoutsetinfo(hash_option, res0['bestblock'])
+            res3 = index_node.gettxoutsetinfo(hash_option, convert_to_json_for_cli(self.options.usecli, res0['bestblock']))
             del res3['block_info'], res3['total_unspendable_amount']
             res3.pop('muhash', None)
             assert_equal(res0, res3)
@@ -244,7 +244,7 @@ class CoinStatsIndexTest(BitcoinTestFramework):
         assert_equal(res12, res10)
 
         self.log.info("Test obtaining info for a non-existent block hash")
-        assert_raises_rpc_error(-5, "Block not found", index_node.gettxoutsetinfo, hash_type="none", hash_or_height="ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", use_index=True)
+        assert_raises_rpc_error(-5, "Block not found", index_node.gettxoutsetinfo, hash_type="none", hash_or_height=convert_to_json_for_cli(self.options.usecli, "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"), use_index=True)
 
     def _test_use_index_option(self):
         self.log.info("Test use_index option for nodes running the index")
@@ -279,7 +279,7 @@ class CoinStatsIndexTest(BitcoinTestFramework):
         assert_not_equal(res["muhash"], res_invalid["muhash"])
 
         # Test that requesting reorged out block by hash is still returning correct results
-        res_invalid2 = index_node.gettxoutsetinfo(hash_type='muhash', hash_or_height=reorg_block)
+        res_invalid2 = index_node.gettxoutsetinfo(hash_type='muhash', hash_or_height=convert_to_json_for_cli(self.options.usecli, reorg_block))
         assert_equal(res_invalid2["muhash"], res_invalid["muhash"])
         assert_not_equal(res["muhash"], res_invalid2["muhash"])
 
diff --git a/test/functional/feature_fastprune.py b/test/functional/feature_fastprune.py
index ca6877b9019..1338ebfe7ef 100755
--- a/test/functional/feature_fastprune.py
+++ b/test/functional/feature_fastprune.py
@@ -14,6 +14,7 @@ class FeatureFastpruneTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
         self.extra_args = [["-fastprune"]]
+        self.supports_cli = False
 
     def run_test(self):
         self.log.info("ensure that large blocks don't crash or freeze in -fastprune")
diff --git a/test/functional/feature_fee_estimation.py b/test/functional/feature_fee_estimation.py
index 61db186de17..bf16bf6c482 100755
--- a/test/functional/feature_fee_estimation.py
+++ b/test/functional/feature_fee_estimation.py
@@ -148,6 +148,7 @@ class EstimateFeeTest(BitcoinTestFramework):
             ["-blockmaxweight=68000"],
             ["-blockmaxweight=32000"],
         ]
+        self.supports_cli = False
 
     def setup_network(self):
         """
diff --git a/test/functional/feature_reindex_readonly.py b/test/functional/feature_reindex_readonly.py
index 858a67566f9..393972b67d9 100755
--- a/test/functional/feature_reindex_readonly.py
+++ b/test/functional/feature_reindex_readonly.py
@@ -17,6 +17,7 @@ class BlockstoreReindexTest(BitcoinTestFramework):
         self.setup_clean_chain = True
         self.num_nodes = 1
         self.extra_args = [["-fastprune"]]
+        self.supports_cli = False
 
     def reindex_readonly(self):
         self.log.debug("Generate block big enough to start second block file")
diff --git a/test/functional/feature_taproot.py b/test/functional/feature_taproot.py
index 68fde4eaa88..ee91e33607d 100755
--- a/test/functional/feature_taproot.py
+++ b/test/functional/feature_taproot.py
@@ -1320,6 +1320,7 @@ class TaprootTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
         self.setup_clean_chain = True
+        self.supports_cli = False
 
     def block_submit(self, node, txs, msg, err_msg, cb_pubkey=None, fees=0, sigops_weight=0, witness=False, accept=False):
 
diff --git a/test/functional/mempool_package_rbf.py b/test/functional/mempool_package_rbf.py
index 4dc6f8fe364..73b1c25ef35 100755
--- a/test/functional/mempool_package_rbf.py
+++ b/test/functional/mempool_package_rbf.py
@@ -36,6 +36,7 @@ class PackageRBFTest(BitcoinTestFramework):
             "-datacarriersize=100000",
             "-maxmempool=5",
         ]] * self.num_nodes
+        self.supports_cli = False
 
     def assert_mempool_contents(self, expected=None):
         mempool_util.assert_mempool_contents(self, self.nodes[0], expected, sync=False)
diff --git a/test/functional/p2p_net_deadlock.py b/test/functional/p2p_net_deadlock.py
index 4f1b731e218..cb734a72ed2 100755
--- a/test/functional/p2p_net_deadlock.py
+++ b/test/functional/p2p_net_deadlock.py
@@ -12,6 +12,7 @@ class NetDeadlockTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
+        self.supports_cli = False
 
     def run_test(self):
         node0 = self.nodes[0]
diff --git a/test/functional/p2p_tx_download.py b/test/functional/p2p_tx_download.py
index 2b75c1193d1..e7ab3c07496 100755
--- a/test/functional/p2p_tx_download.py
+++ b/test/functional/p2p_tx_download.py
@@ -69,6 +69,7 @@ class TxDownloadTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 2
         self.extra_args= [['-datacarriersize=100000', '-maxmempool=5', '-persistmempool=0']] * self.num_nodes
+        self.supports_cli = False
 
     def test_tx_requests(self):
         self.log.info("Test that we request transactions from all our peers, eventually")
diff --git a/test/functional/rpc_createmultisig.py b/test/functional/rpc_createmultisig.py
index daf350d4153..17b1d347fd6 100755
--- a/test/functional/rpc_createmultisig.py
+++ b/test/functional/rpc_createmultisig.py
@@ -28,7 +28,6 @@ class RpcCreateMultiSigTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
-        self.supports_cli = False
 
     def create_keys(self, num_keys):
         self.pub = []
diff --git a/test/functional/rpc_deprecated.py b/test/functional/rpc_deprecated.py
index 043577ef111..f26d9f0815c 100755
--- a/test/functional/rpc_deprecated.py
+++ b/test/functional/rpc_deprecated.py
@@ -32,7 +32,7 @@ class DeprecatedRpcTest(BitcoinTestFramework):
             self.log.info("Tests for deprecated wallet-related RPC methods (if any)")
             self.log.info("Test settxfee RPC deprecation")
             self.nodes[0].createwallet("settxfeerpc")
-            assert_raises_rpc_error(-32, 'settxfee is deprecated and will be fully removed in v31.0.', self.nodes[0].rpc.settxfee, 0.01)
+            assert_raises_rpc_error(-32, 'settxfee is deprecated and will be fully removed in v31.0.', self.nodes[0].settxfee, 0.01)
 
 if __name__ == '__main__':
     DeprecatedRpcTest(__file__).main()
diff --git a/test/functional/rpc_estimatefee.py b/test/functional/rpc_estimatefee.py
index 05ceafbe4e0..2b8772269ed 100755
--- a/test/functional/rpc_estimatefee.py
+++ b/test/functional/rpc_estimatefee.py
@@ -21,17 +21,17 @@ class EstimateFeeTest(BitcoinTestFramework):
         assert_raises_rpc_error(-1, "estimatesmartfee", self.nodes[0].estimatesmartfee)
         assert_raises_rpc_error(-1, "estimaterawfee", self.nodes[0].estimaterawfee)
 
-        # wrong type for conf_target
-        assert_raises_rpc_error(-3, "JSON value of type string is not of expected type number", self.nodes[0].estimatesmartfee, 'foo')
-        assert_raises_rpc_error(-3, "JSON value of type string is not of expected type number", self.nodes[0].estimaterawfee, 'foo')
+        # cli handles wrong types differently
+        if not self.options.usecli:
+            # wrong type for conf_target
+            assert_raises_rpc_error(-3, "JSON value of type string is not of expected type number", self.nodes[0].estimatesmartfee, 'foo')
+            assert_raises_rpc_error(-3, "JSON value of type string is not of expected type number", self.nodes[0].estimaterawfee, 'foo')
+            # wrong type for estimatesmartfee(estimate_mode)
+            assert_raises_rpc_error(-3, "JSON value of type number is not of expected type string", self.nodes[0].estimatesmartfee, 1, 1)
+            # wrong type for estimaterawfee(threshold)
+            assert_raises_rpc_error(-3, "JSON value of type string is not of expected type number", self.nodes[0].estimaterawfee, 1, 'foo')
 
-        # wrong type for estimatesmartfee(estimate_mode)
-        assert_raises_rpc_error(-3, "JSON value of type number is not of expected type string", self.nodes[0].estimatesmartfee, 1, 1)
         assert_raises_rpc_error(-8, 'Invalid estimate_mode parameter, must be one of: "unset", "economical", "conservative"', self.nodes[0].estimatesmartfee, 1, 'foo')
-
-        # wrong type for estimaterawfee(threshold)
-        assert_raises_rpc_error(-3, "JSON value of type string is not of expected type number", self.nodes[0].estimaterawfee, 1, 'foo')
-
         # extra params
         assert_raises_rpc_error(-1, "estimatesmartfee", self.nodes[0].estimatesmartfee, 1, 'ECONOMICAL', 1)
         assert_raises_rpc_error(-1, "estimaterawfee", self.nodes[0].estimaterawfee, 1, 1, 1)
diff --git a/test/functional/rpc_generate.py b/test/functional/rpc_generate.py
index 618bbb2e007..fdaaf4cbec4 100755
--- a/test/functional/rpc_generate.py
+++ b/test/functional/rpc_generate.py
@@ -124,11 +124,12 @@ class RPCGenerateTest(BitcoinTestFramework):
             "cli option. Refer to -help for more information.\n"
         )
 
-        self.log.info("Test rpc generate raises with message to use cli option")
-        assert_raises_rpc_error(-32601, message, self.nodes[0].rpc.generate)
+        if not self.options.usecli:
+            self.log.info("Test rpc generate raises with message to use cli option")
+            assert_raises_rpc_error(-32601, message, self.nodes[0].rpc.generate)
 
-        self.log.info("Test rpc generate help prints message to use cli option")
-        assert_equal(message, self.nodes[0].help("generate"))
+            self.log.info("Test rpc generate help prints message to use cli option")
+            assert_equal(message, self.nodes[0].help("generate"))
 
         self.log.info("Test rpc generate is a hidden command not discoverable in general help")
         assert message not in self.nodes[0].help()
diff --git a/test/functional/rpc_getblockfrompeer.py b/test/functional/rpc_getblockfrompeer.py
index 62b3d664e0f..3a32d83018c 100755
--- a/test/functional/rpc_getblockfrompeer.py
+++ b/test/functional/rpc_getblockfrompeer.py
@@ -67,8 +67,11 @@ class GetBlockFromPeerTest(BitcoinTestFramework):
 
         self.log.info("Arguments must be valid")
         assert_raises_rpc_error(-8, "hash must be of length 64 (not 4, for '1234')", self.nodes[0].getblockfrompeer, "1234", peer_0_peer_1_id)
-        assert_raises_rpc_error(-3, "JSON value of type number is not of expected type string", self.nodes[0].getblockfrompeer, 1234, peer_0_peer_1_id)
-        assert_raises_rpc_error(-3, "JSON value of type string is not of expected type number", self.nodes[0].getblockfrompeer, short_tip, "0")
+
+        # cli handles wrong types differently
+        if not self.options.usecli:
+            assert_raises_rpc_error(-3, "JSON value of type number is not of expected type string", self.nodes[0].getblockfrompeer, 1234, peer_0_peer_1_id)
+            assert_raises_rpc_error(-3, "JSON value of type string is not of expected type number", self.nodes[0].getblockfrompeer, short_tip, "0")
 
         self.log.info("We must already have the header")
         assert_raises_rpc_error(-1, "Block header missing", self.nodes[0].getblockfrompeer, "00" * 32, 0)
diff --git a/test/functional/rpc_getblockstats.py b/test/functional/rpc_getblockstats.py
index 002763201a5..03ae5cb2226 100755
--- a/test/functional/rpc_getblockstats.py
+++ b/test/functional/rpc_getblockstats.py
@@ -12,6 +12,7 @@ from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
     assert_raises_rpc_error,
+    convert_to_json_for_cli,
 )
 import json
 import os
@@ -35,7 +36,6 @@ class GetblockstatsTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
         self.setup_clean_chain = True
-        self.supports_cli = False
 
     def get_stats(self):
         return [self.nodes[0].getblockstats(hash_or_height=self.start_height + i) for i in range(self.max_stat_pos+1)]
@@ -119,7 +119,7 @@ class GetblockstatsTest(BitcoinTestFramework):
 
             # Check selecting block by hash too
             blockhash = self.expected_stats[i]['blockhash']
-            stats_by_hash = self.nodes[0].getblockstats(hash_or_height=blockhash)
+            stats_by_hash = self.nodes[0].getblockstats(hash_or_height=convert_to_json_for_cli(self.options.usecli, blockhash))
             assert_equal(stats_by_hash, self.expected_stats[i])
 
         # Make sure each stat can be queried on its own
@@ -161,10 +161,10 @@ class GetblockstatsTest(BitcoinTestFramework):
                                 self.nodes[0].getblockstats, hash_or_height=1, stats=['minfee', f'aaa{inv_sel_stat}'])
         # Mainchain's genesis block shouldn't be found on regtest
         assert_raises_rpc_error(-5, 'Block not found', self.nodes[0].getblockstats,
-                                hash_or_height='000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f')
+                                hash_or_height=convert_to_json_for_cli(self.options.usecli,'000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f'))
 
         # Invalid number of args
-        assert_raises_rpc_error(-1, 'getblockstats hash_or_height ( stats )', self.nodes[0].getblockstats, '00', 1, 2)
+        assert_raises_rpc_error(-1, 'getblockstats hash_or_height ( stats )', self.nodes[0].getblockstats, convert_to_json_for_cli(self.options.usecli,'00'), 1, 2)
         assert_raises_rpc_error(-1, 'getblockstats hash_or_height ( stats )', self.nodes[0].getblockstats)
 
         self.log.info('Test block height 0')
@@ -185,7 +185,7 @@ class GetblockstatsTest(BitcoinTestFramework):
         self.log.info("Test when only header is known")
         block = self.generateblock(self.nodes[0], output="raw(55)", transactions=[], submit=False)
         self.nodes[0].submitheader(block["hex"])
-        assert_raises_rpc_error(-1, "Block not available (not fully downloaded)", lambda: self.nodes[0].getblockstats(block['hash']))
+        assert_raises_rpc_error(-1, "Block not available (not fully downloaded)", lambda: self.nodes[0].getblockstats(convert_to_json_for_cli(self.options.usecli,block['hash'])))
 
         self.log.info('Test when block is missing')
         (self.nodes[0].blocks_path / 'blk00000.dat').rename(self.nodes[0].blocks_path / 'blk00000.dat.backup')
diff --git a/test/functional/rpc_getdescriptorinfo.py b/test/functional/rpc_getdescriptorinfo.py
index 65aa6dd47c8..56a8faaff98 100755
--- a/test/functional/rpc_getdescriptorinfo.py
+++ b/test/functional/rpc_getdescriptorinfo.py
@@ -35,7 +35,9 @@ class DescriptorTest(BitcoinTestFramework):
 
     def run_test(self):
         assert_raises_rpc_error(-1, 'getdescriptorinfo', self.nodes[0].getdescriptorinfo)
-        assert_raises_rpc_error(-3, 'JSON value of type number is not of expected type string', self.nodes[0].getdescriptorinfo, 1)
+        # cli handles wrong types differently
+        if not self.options.usecli:
+            assert_raises_rpc_error(-3, 'JSON value of type number is not of expected type string', self.nodes[0].getdescriptorinfo, 1)
         assert_raises_rpc_error(-5, "'' is not a valid descriptor function", self.nodes[0].getdescriptorinfo, "")
         assert_raises_rpc_error(-5, "pk(): Key ' 0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798' is invalid due to whitespace", self.nodes[0].getdescriptorinfo, "pk( 0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798)")
         assert_raises_rpc_error(-5, "pk(): Key '0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 ' is invalid due to whitespace", self.nodes[0].getdescriptorinfo, "pk(0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 )")
diff --git a/test/functional/rpc_help.py b/test/functional/rpc_help.py
index 01a633a83d1..802a55492f2 100755
--- a/test/functional/rpc_help.py
+++ b/test/functional/rpc_help.py
@@ -45,7 +45,6 @@ def process_mapping(fname):
 class HelpRpcTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
-        self.supports_cli = False
         self.uses_wallet = None
 
     def run_test(self):
@@ -93,7 +92,8 @@ class HelpRpcTest(BitcoinTestFramework):
         assert_raises_rpc_error(-1, 'help', node.help, 'foo', 'bar')
 
         # invalid argument
-        assert_raises_rpc_error(-3, "JSON value of type number is not of expected type string", node.help, 0)
+        if not self.options.usecli:
+            assert_raises_rpc_error(-3, "JSON value of type number is not of expected type string", node.help, 0)
 
         # help of unknown command
         assert_equal(node.help('foo'), 'help: unknown command: foo')
diff --git a/test/functional/rpc_invalid_address_message.py b/test/functional/rpc_invalid_address_message.py
index bbd6955b563..25d8a68a1aa 100755
--- a/test/functional/rpc_invalid_address_message.py
+++ b/test/functional/rpc_invalid_address_message.py
@@ -97,10 +97,12 @@ class InvalidAddressErrorMessageTest(BitcoinTestFramework):
 
         node = self.nodes[0]
 
-        # Missing arg returns the help text
-        assert_raises_rpc_error(-1, "Return information about the given bitcoin address.", node.validateaddress)
-        # Explicit None is not allowed for required parameters
-        assert_raises_rpc_error(-3, "JSON value of type null is not of expected type string", node.validateaddress, None)
+
+        if not self.options.usecli:
+            # Missing arg returns the help text
+            assert_raises_rpc_error(-1, "Return information about the given bitcoin address.", node.validateaddress)
+            # Explicit None is not allowed for required parameters
+            assert_raises_rpc_error(-3, "JSON value of type null is not of expected type string", node.validateaddress, None)
 
     def test_getaddressinfo(self):
         node = self.nodes[0]
diff --git a/test/functional/rpc_packages.py b/test/functional/rpc_packages.py
index a2f9210f94d..10c11f19683 100755
--- a/test/functional/rpc_packages.py
+++ b/test/functional/rpc_packages.py
@@ -38,6 +38,7 @@ class RPCPackagesTest(BitcoinTestFramework):
         self.setup_clean_chain = True
         # whitelist peers to speed up tx relay / mempool sync
         self.noban_tx_relay = True
+        self.supports_cli = False
 
     def assert_testres_equal(self, package_hex, testres_expected):
         """Shuffle package_hex and assert that the testmempoolaccept result matches testres_expected. This should only
diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py
index deb519803cf..51ba0015a9c 100755
--- a/test/functional/rpc_psbt.py
+++ b/test/functional/rpc_psbt.py
@@ -66,7 +66,6 @@ class PSBTTest(BitcoinTestFramework):
         # whitelist peers to speed up tx relay / mempool sync
         for args in self.extra_args:
             args.append("-whitelist=noban@127.0.0.1")
-        self.supports_cli = False
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
@@ -90,7 +89,7 @@ class PSBTTest(BitcoinTestFramework):
         signed_psbt_obj.g.map[PSBT_GLOBAL_UNSIGNED_TX] = bytes.fromhex(raw)
 
         # Check that the walletprocesspsbt call succeeds but also recognizes that the transaction is not complete
-        signed_psbt_incomplete = wallet.walletprocesspsbt(signed_psbt_obj.to_base64(), finalize=False)
+        signed_psbt_incomplete = wallet.walletprocesspsbt(psbt=signed_psbt_obj.to_base64(), finalize=False)
         assert signed_psbt_incomplete["complete"] is False
 
     def test_utxo_conversion(self):
diff --git a/test/functional/rpc_whitelist.py b/test/functional/rpc_whitelist.py
index a35c89fadd2..b103289fab3 100755
--- a/test/functional/rpc_whitelist.py
+++ b/test/functional/rpc_whitelist.py
@@ -33,6 +33,7 @@ class RPCWhitelistTest(BitcoinTestFramework):
 
     def set_test_params(self):
         self.num_nodes = 1
+        self.supports_cli = False
 
     def run_test(self):
         # 0 => Username
diff --git a/test/functional/test_framework/test_node.py b/test/functional/test_framework/test_node.py
index 9f0baaccca2..c2af077643c 100755
--- a/test/functional/test_framework/test_node.py
+++ b/test/functional/test_framework/test_node.py
@@ -862,7 +862,7 @@ def arg_to_cli(arg):
         return str(arg).lower()
     elif arg is None:
         return 'null'
-    elif isinstance(arg, dict) or isinstance(arg, list):
+    elif isinstance(arg, dict) or isinstance(arg, list) or isinstance(arg, tuple):
         return json.dumps(arg, default=serialization_fallback)
     else:
         return str(arg)
@@ -899,7 +899,7 @@ class TestNodeCLI():
     def send_cli(self, clicommand=None, *args, **kwargs):
         """Run bitcoin-cli command. Deserializes returned string as python object."""
         pos_args = [arg_to_cli(arg) for arg in args]
-        named_args = [str(key) + "=" + arg_to_cli(value) for (key, value) in kwargs.items()]
+        named_args = [str(key) + "=" + arg_to_cli(value) for (key, value) in kwargs.items() if value is not None]
         p_args = self.binaries.rpc_argv() + [f"-datadir={self.datadir}"] + self.options
         if named_args:
             p_args += ["-named"]
@@ -948,8 +948,8 @@ class RPCOverloadWrapper():
     def addmultisigaddress(self, nrequired, keys, *, label=None, address_type=None):
         wallet_info = self.getwalletinfo()
         if 'descriptors' not in wallet_info or ('descriptors' in wallet_info and not wallet_info['descriptors']):
-            return self.__getattr__('addmultisigaddress')(nrequired, keys, label, address_type)
-        cms = self.createmultisig(nrequired, keys, address_type)
+            return self.__getattr__('addmultisigaddress')(nrequired, keys, label, address_type=address_type)
+        cms = self.createmultisig(nrequired, keys, address_type=address_type)
         req = [{
             'desc': cms['descriptor'],
             'timestamp': 0,
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index f7acc290a5b..91ed137e415 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -610,3 +610,8 @@ def sync_txindex(test_framework, node):
     sync_start = int(time.time())
     test_framework.wait_until(lambda: node.getindexinfo("txindex")["txindex"]["synced"])
     test_framework.log.debug(f"Synced in {time.time() - sync_start} seconds")
+
+def convert_to_json_for_cli(cli, text):
+    if cli:
+        return json.dumps(text)
+    return text
diff --git a/test/functional/wallet_address_types.py b/test/functional/wallet_address_types.py
index d8c2aab36de..0c4e9c9b388 100755
--- a/test/functional/wallet_address_types.py
+++ b/test/functional/wallet_address_types.py
@@ -78,7 +78,6 @@ class AddressTypeTest(BitcoinTestFramework):
         ]
         # whitelist peers to speed up tx relay / mempool sync
         self.noban_tx_relay = True
-        self.supports_cli = False
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
diff --git a/test/functional/wallet_bumpfee.py b/test/functional/wallet_bumpfee.py
index 00ce40b4475..05965caacd3 100755
--- a/test/functional/wallet_bumpfee.py
+++ b/test/functional/wallet_bumpfee.py
@@ -139,8 +139,9 @@ class BumpFeeTest(BitcoinTestFramework):
             assert_raises_rpc_error(-8, msg, rbf_node.bumpfee, rbfid, fee_rate=zero_value)
         msg = "Invalid amount"
         # Test fee_rate values that don't pass fixed-point parsing checks.
-        for invalid_value in ["", 0.000000001, 1e-09, 1.111111111, 1111111111111111, "31.999999999999999999999"]:
-            assert_raises_rpc_error(-3, msg, rbf_node.bumpfee, rbfid, fee_rate=invalid_value)
+        if not self.options.usecli:
+            for invalid_value in ["", 0.000000001, 1e-09, 1.111111111, 1111111111111111, "31.999999999999999999999"]:
+                assert_raises_rpc_error(-3, msg, rbf_node.bumpfee, rbfid, fee_rate=invalid_value)
         # Test fee_rate values that cannot be represented in sat/vB.
         for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999]:
             assert_raises_rpc_error(-3, msg, rbf_node.bumpfee, rbfid, fee_rate=invalid_value)
@@ -164,9 +165,10 @@ class BumpFeeTest(BitcoinTestFramework):
             rbf_node.bumpfee, rbfid, {"confTarget": 123, "conf_target": 456})
 
         self.log.info("Test invalid estimate_mode settings")
-        for k, v in {"number": 42, "object": {"foo": "bar"}}.items():
-            assert_raises_rpc_error(-3, f"JSON value of type {k} for field estimate_mode is not of expected type string",
-                rbf_node.bumpfee, rbfid, estimate_mode=v)
+        if not self.options.usecli:
+            for k, v in {"number": 42, "object": {"foo": "bar"}}.items():
+                assert_raises_rpc_error(-3, f"JSON value of type {k} for field estimate_mode is not of expected type string",
+                    rbf_node.bumpfee, rbfid, estimate_mode=v)
         for mode in ["foo", Decimal("3.1415"), "sat/B", "BTC/kB"]:
             assert_raises_rpc_error(-8, 'Invalid estimate_mode parameter, must be one of: "unset", "economical", "conservative"',
                 rbf_node.bumpfee, rbfid, estimate_mode=mode)
diff --git a/test/functional/wallet_encryption.py b/test/functional/wallet_encryption.py
index b85c35cb12e..858bc64dd8a 100755
--- a/test/functional/wallet_encryption.py
+++ b/test/functional/wallet_encryption.py
@@ -90,14 +90,15 @@ class WalletEncryptionTest(BitcoinTestFramework):
         assert_equal(actual_time, expected_time)
         self.nodes[0].walletlock()
 
-        # Test passphrase with null characters
-        passphrase_with_nulls = "Phrase\0With\0Nulls"
-        self.nodes[0].walletpassphrasechange(passphrase2, passphrase_with_nulls)
-        # walletpassphrasechange should not stop at null characters
-        assert_raises_rpc_error(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase_with_nulls.partition("\0")[0], 10)
-        with WalletUnlock(self.nodes[0], passphrase_with_nulls):
-            sig = self.nodes[0].signmessage(address, msg)
-            assert self.nodes[0].verifymessage(address, sig, msg)
+        if not self.options.usecli: # can't be done with the test framework for cli since subprocess.Popen doesn't allow null characters
+            # Test passphrase with null characters
+            passphrase_with_nulls = "Phrase\0With\0Nulls"
+            self.nodes[0].walletpassphrasechange(passphrase2, passphrase_with_nulls)
+            # walletpassphrasechange should not stop at null characters
+            assert_raises_rpc_error(-14, "wallet passphrase entered was incorrect", self.nodes[0].walletpassphrase, passphrase_with_nulls.partition("\0")[0], 10)
+            with WalletUnlock(self.nodes[0], passphrase_with_nulls):
+                sig = self.nodes[0].signmessage(address, msg)
+                assert self.nodes[0].verifymessage(address, sig, msg)
 
         self.log.info("Test that wallets without private keys cannot be encrypted")
         self.nodes[0].createwallet(wallet_name="noprivs", disable_private_keys=True)
diff --git a/test/functional/wallet_fundrawtransaction.py b/test/functional/wallet_fundrawtransaction.py
index aeaa8e54622..768c93eb485 100755
--- a/test/functional/wallet_fundrawtransaction.py
+++ b/test/functional/wallet_fundrawtransaction.py
@@ -49,6 +49,7 @@ class RawTransactionsTest(BitcoinTestFramework):
         # whitelist peers to speed up tx relay / mempool sync
         self.noban_tx_relay = True
         self.rpc_timeout = 90  # to prevent timeouts in `test_transaction_too_large`
+        self.supports_cli = False
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
diff --git a/test/functional/wallet_miniscript.py b/test/functional/wallet_miniscript.py
index 302e03e4597..2de0992c62b 100755
--- a/test/functional/wallet_miniscript.py
+++ b/test/functional/wallet_miniscript.py
@@ -206,6 +206,7 @@ class WalletMiniscriptTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
         self.rpc_timeout = 180
+        self.supports_cli = False
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
diff --git a/test/functional/wallet_send.py b/test/functional/wallet_send.py
index 067df43e50a..21761775c53 100755
--- a/test/functional/wallet_send.py
+++ b/test/functional/wallet_send.py
@@ -29,6 +29,7 @@ class WalletSendTest(BitcoinTestFramework):
         self.num_nodes = 2
         # whitelist peers to speed up tx relay / mempool sync
         self.noban_tx_relay = True
+        self.supports_cli = False
         self.extra_args = [
             ["-walletrbf=1"],
             ["-walletrbf=1"]