Can all consensus valid 64 byte transactions be (third party) malleated to change their size?

The Great Consensus Cleanup proposes to make 64 byte transactions consensus invalid, for various reasons. They have been non-standard for years and appear to serve no useful purpose.

It appears that any such transaction can be malleated into a different size, so that in practice there is no confiscation risk even if such a transaction were useful. I'm trying to understand this aspect better.

Given a UTXO A, which either already exists or is freshly mined under the current consensus rules (e.g. through a non-standard transaction).

Given a 64 byte transaction T that spends it (non-standard by definition).

Without access to the secrets (if any) that were used to generate T (private key, hash pre-image, etc.)

Is it always possible to change T into a consensus valid transaction T' that spends A?

Additionally, if I understand correctly, it's not possible for any 64 byte transaction T to send coins to a destination B that is a secure (i.e. >= 20 byte) public key (hash).

Regardless, for every B, is there a malleated T' that preserves B (at least still spendable by the private key b)?

If the latter is too hard to prove, could one could show that any T can be malleated by an attacker to divert coins away from B.



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