If you have a good mechanism for key rotation, and you are properly specifying keys as both the cryptographic configuration and raw key bytes rather than just the raw bytes, you’re most of the way to migrating to post-quantum. If you have a good mechanism for key rotation, and you are properly specifying keys as both the cryptographic configuration and raw key bytes rather than just the raw bytes, you’re most of the way to migrating to post-quantum. In an era when we have to rely on post-quantum Key Encapsulation Mechanisms (KEMs) instead of post-quantum Diffie-Hellman based schemes, developing robust key exchange protocols with post-quantum qualities is a strong step forward and a promising area of research.