On the other side, I thought Kallewoof was following this BIP322 thread. If he does not, sending this use-case in an e-mail is a good idea.
No he isn't. In fact all the important technical stuff is being discussed in this pull request:
https://github.com/bitcoin/bips/pull/1347 and on the bitcoin-dev mailing list.
Admittedly the proposal hasn't had much talk since around 2022.
Would you like to do it, considering your started this bitcointalk post? If not, I gonna send him an message this week. (Just so you know: I don't have his e-mail.)
I actually don't have his email address, or at least, I don't remember if I ever used email to contact him (It was mainly by Github). But you should be able to get an audience if you post this on the mailing list now that it's moved to Google Groups.