Haha sorry for hijacking your thread @starius! We did get a bit off-topic from the OP.
I have more to say on P2TRv2, but for now I will hold my tongue and issue a request to proponents of P2TRv2: solve the EC-disabling timing problem, then let’s circle back and reassess. Otherwise P2TRv2 is DOA, because it would be built on hope and not cryptography. Until then, I doubt further debate will be fruitful.
As for the excellent OP idea, I look forward to getting this into P2MR 