There is this guy: https://clima.protoart.net/

It looks to tick a lot of boxes but isn't quite what I want, and is just expensive enough that I haven't pulled the trigger to test one out anyway. It seems to be well regarded if it does what you're looking for.

(I really only want to add wall thermostats to a new-built house that was designed for mini-splits for the beginning, so it has crappy remotes but no wall thermostats, and to have some button I can press for "all off" to make sure all the mini-splits are actually off. Other features welcome, but those are what I'm really after.)