Even if UNSC reform is perfectly logical in theory, in practice they would never work. The UK and France have a veto in the UNSC, which means they can halt any kind of reform of the UNSC which is not in their interest. Losing a permanent seat without getting a clear benefit in return is definitely against their interest. Even if they were to retain control over foreign policy no nation would want to move from having sole control of a seat to having to negotiate with its partners which way it will vote. As such the UK and France would veto any such proposal.