Satoshi-era coins are not lost coins, and the fact that we, bitcoiners as majority, have passively accepted them as lost is something that is worth examination. We have seen some of those coins being spent after more than 10 years of inactivity, and yet we still treat them as "lost". If "price stability" is what we truly wanted, then why not freezing them at the present? In the end, it'd be within the realms of possibility that Patoshi woke up and spent his coins. I think you understand how this opens a can of worms.
FALCON-512 seems the best solution, at the moment, but the block size has to increase, otherwise the throughput would dramatically decrease. My thought is that we should increase the block size by the same order as a regular transaction size is increased. FALCON's signature verification is also a lot faster than currently, so the idea that the block size increase would result in slower block sync and verification does not hold.
I don't like phase C's zero knowledge recovery as a concept. Based on which standard do we accept zk? BIP39, Electrum, something else? It can be very complicated. Also, Satoshi-era coins are sitting on public keys, and there is no more knowledge the true owner can provide than the quantum attacker.
I think that finding consensus for this issue should be the highest priority right now.