Re: Why will nodes not relay non-standard txs?

Yeah, it feels like there should be some patterns that you could reasonably convincingly argue don't have any additional DoS risk when used in P2SH.

I created a draft BIP (note: the numbering isn't actually allocated)

https://github.com/TierNolan/bips/blob/bip4x/bip-0046.mediawiki

and also one about hash releases

https://github.com/TierNolan/bips/blob/bip4x/bip-0045.mediawiki

The hash release one is more critical. You can do the if thing with multiple transactions.