diff --git a/crates/circuit/src/dag_circuit.rs b/crates/circuit/src/dag_circuit.rs
index 91b13cf9e849..e8429a22957a 100644
--- a/crates/circuit/src/dag_circuit.rs
+++ b/crates/circuit/src/dag_circuit.rs
@@ -17,7 +17,7 @@ use crate::circuit_instruction::{
 };
 use crate::dag_node::{DAGInNode, DAGNode, DAGOpNode, DAGOutNode};
 use crate::error::DAGCircuitError;
-use crate::imports::VARIABLE_MAPPER;
+use crate::imports::{DAG_NODE, VARIABLE_MAPPER};
 use crate::interner::{Index, IndexedInterner, Interner};
 use crate::operations::{Operation, OperationType, Param};
 use crate::{interner, BitType, Clbit, Qubit, SliceOrInt, TupleLikeArg};
@@ -138,7 +138,9 @@ pub struct DAGCircuit {
 
     dag: StableDiGraph<NodeType, Wire>,
 
+    #[pyo3(get)]
     qregs: Py<PyDict>,
+    #[pyo3(get)]
     cregs: Py<PyDict>,
 
     /// The cache used to intern instruction qargs.
@@ -384,6 +386,35 @@ impl DAGCircuit {
         })
     }
 
+    /// Returns the current sequence of registered :class:`.Qubit` instances as a list.
+    ///
+    /// .. warning::
+    ///
+    ///     Do not modify this list yourself.  It will invalidate the :class:`DAGCircuit` data
+    ///     structures.
+    ///
+    /// Returns:
+    ///     list(:class:`.Qubit`): The current sequence of registered qubits.
+    #[getter]
+    pub fn qubits(&self, py: Python<'_>) -> Py<PyList> {
+        self.qubits.cached().clone_ref(py)
+    }
+
+    /// Returns the current sequence of registered :class:`.Clbit`
+    /// instances as a list.
+    ///
+    /// .. warning::
+    ///
+    ///     Do not modify this list yourself.  It will invalidate the :class:`DAGCircuit` data
+    ///     structures.
+    ///
+    /// Returns:
+    ///     list(:class:`.Clbit`): The current sequence of registered clbits.
+    #[getter]
+    pub fn clbits(&self, py: Python<'_>) -> Py<PyList> {
+        self.clbits.cached().clone_ref(py)
+    }
+
     /// Return a list of the wires in order.
     #[getter]
     fn get_wires(&self, py: Python<'_>) -> Py<PyList> {
@@ -1878,14 +1909,23 @@ def _format(operand):
             }
         }
 
-        //
-        // def node_eq(node_self, node_other):
-        //     return DAGNode.semantic_eq(node_self, node_other, self_bit_indices, other_bit_indices)
-        //
-        // return rx.is_isomorphic_node_match(self._multi_graph, other._multi_graph, node_eq)
         todo!()
+        // Check for VF2 isomorphic match.
+        // self.topological_nodes()
+        // let semantic_eq = DAG_NODE.get_bound(py).getattr(intern!(py, "semantic_eq"))?;
+        // let node_match = |n1, n2| -> bool {
+        //     semantic_eq
+        //         .call1((n1, n2, self_bit_indices, other_bit_indices)).map_or(false, |r| r.extract().unwrap_or(false))
+        // };
+        // Ok(petgraph::algo::is_isomorphic_matching(
+        //     &self.dag,
+        //     &other.dag,
+        //     node_match,
+        //     |_, _| true,
+        // ))
     }
 
+
     /// Yield nodes in topological order.
     ///
     /// Args:
diff --git a/crates/circuit/src/imports.rs b/crates/circuit/src/imports.rs
index 0df3707cc025..b0c0d63ac869 100644
--- a/crates/circuit/src/imports.rs
+++ b/crates/circuit/src/imports.rs
@@ -74,6 +74,8 @@ pub static SINGLETON_CONTROLLED_GATE: ImportOnceCell =
 pub static VARIABLE_MAPPER: ImportOnceCell =
     ImportOnceCell::new("qiskit.circuit._classical_resource_map", "VariableMapper");
 
+pub static DAG_NODE: ImportOnceCell = ImportOnceCell::new("qiskit.dagcircuit", "DAGNode");
+
 /// A mapping from the enum variant in crate::operations::StandardGate to the python
 /// module path and class name to import it. This is used to populate the conversion table
 /// when a gate is added directly via the StandardGate path and there isn't a Python object
diff --git a/crates/circuit/src/lib.rs b/crates/circuit/src/lib.rs
index 3d5b1c702c47..56cc3871e730 100644
--- a/crates/circuit/src/lib.rs
+++ b/crates/circuit/src/lib.rs
@@ -26,6 +26,7 @@ mod interner;
 use pyo3::prelude::*;
 use pyo3::types::{PySequence, PySlice, PyTuple};
 use std::ops::Deref;
+use pyo3::DowncastError;
 
 /// A private enumeration type used to extract arguments to pymethod
 /// that may be either an index or a slice
@@ -49,8 +50,18 @@ pub struct TupleLikeArg<'py> {
 
 impl<'py> FromPyObject<'py> for TupleLikeArg<'py> {
     fn extract_bound(ob: &Bound<'py, PyAny>) -> PyResult<Self> {
+        let value = match ob.downcast::<PySequence>() {
+            Ok(seq) => {seq.to_tuple()?}
+            Err(_) => {
+                PyTuple::new_bound(
+                    ob.py(),
+                    ob.iter()?
+                        .map(|o| Ok(o?.unbind()))
+                        .collect::<PyResult<Vec<PyObject>>>()?)
+            }
+        };
         Ok(TupleLikeArg {
-            value: ob.downcast::<PySequence>()?.to_tuple()?,
+            value,
         })
     }
 }
diff --git a/qiskit/transpiler/passes/calibration/rzx_templates.py b/qiskit/transpiler/passes/calibration/rzx_templates.py
index 406e5e75de04..12211f18b2bc 100644
--- a/qiskit/transpiler/passes/calibration/rzx_templates.py
+++ b/qiskit/transpiler/passes/calibration/rzx_templates.py
@@ -20,17 +20,6 @@
 from qiskit.circuit.library.templates import rzx
 
 
-class RZXTemplateMap(Enum):
-    """Mapping of instruction name to decomposition template."""
-
-    ZZ1 = rzx.rzx_zz1()
-    ZZ2 = rzx.rzx_zz2()
-    ZZ3 = rzx.rzx_zz3()
-    YZ = rzx.rzx_yz()
-    XZ = rzx.rzx_xz()
-    CY = rzx.rzx_cy()
-
-
 def rzx_templates(template_list: List[str] = None) -> Dict:
     """Convenience function to get the cost_dict and templates for template matching.
 
@@ -40,6 +29,16 @@ def rzx_templates(template_list: List[str] = None) -> Dict:
     Returns:
         Decomposition templates and cost values.
     """
+    class RZXTempateMap(Enum):
+        """Mapping of instruction name to decomposition template."""
+
+        ZZ1 = rzx.rzx_zz1()
+        ZZ2 = rzx.rzx_zz2()
+        ZZ3 = rzx.rzx_zz3()
+        YZ = rzx.rzx_yz()
+        XZ = rzx.rzx_xz()
+        CY = rzx.rzx_cy()
+
     if template_list is None:
         template_list = ["zz1", "zz2", "zz3", "yz", "xz", "cy"]