In Qiskit, I am looking for a convenient way to "strip-off" a
QuantumCircuit object from its multiple
ClassicalRegister objects, such that in the final
QuantumCircuit object there will be only 1
QuantumRegister and 1
ClassicalRegister, without any loss of the circuit's qubits, bits or content.
I haven't found any built-in option in Qiskit for this feature so far. However, when I look at a job page in IBM Quantum website I see a QASM code of the job's circuit exactly as I am looking for (with 1 qreg and 1 creg). So I infer there is a convenient way to implement this.