Tidbits of post-quantum ETH

Vitalik Buterin's post-quantum tasklist for Ethereum lists components that would need upgrading if a cryptographically relevant quantum computer is built, since Shor's and Grover's algorithms could break ECDSA and ECDH and weaken hash functions. The article says BIP39 seed phrases and EIP-2333 validator withdrawal keys are fine, while BIP32 derivation, transaction signing, address format, KZG verification and the EVM's KECCAK256 opcode need replacing. It proposes Falcon or SLH-DSA for signatures, which would produce larger keys and signatures; for example, Falcon-1024 has 1.75KB keys and 1.25KB signatures. The author is confident these problems can be solved and suggests that, if such a computer appears soon, a hard fork could freeze accounts and use BIP39 with ZK-proofs to move funds into a post-quantum scheme.