Just wanted to throw out this proposal for enabling folks to optionally incorporate PQC protection that doesn't require upfront implementation of PQC logic/validation code: https://github.com/csuwildcat/pqc-precommitment-migration. I think it could be a reasonable middle ground between the (reasonable) hesitance to integrate PQC code into Bitcoin today vs the desire of some to have a clear mitigation plan in the unlikely event a Q-Day occurred in the near or mid-term.