We can do that.

I think we can just edit the NIP-72 to redefine kind 11 in its context. And also NIP-87 could be better if it used that? nostr:npub1jlrs53pkdfjnts29kveljul2sm0actt6n8dxrrzqcersttvcuv3qdjynqn

But honestly you should all consider adopting NIP-29 instead -- or finding some more flaws in it.