no, i think that's a bad idea.  its doubling down on a bad design choice.  lots of things will and should produce odd npubs, like hardware wallets etc.  and there already are many users with '3', its not fair to invalidate, deprecate or cancel those accounts.  just let 2s be 2s and 3s be 3s.  and find work arounds such as kind=0.  in any case im not touching it, because the protocol might get even more broken by well-intended efforts to fix a bad original choice.  and we cant cancel half the user base, the system is already running... use workarounds!