Yep that was exactly my thought process haha. For what it’s worth, raspian is pretty good and Ubuntu 22.04 works great on the PI4, I have 4 or 5 around here and they have been awesome.
Now I am curious though, what are you going to use for the key store? That is one of the things on my list to set up pretty soon here as well and I was going to put it on a pi myself. Also, if you haven’t seen this thing or this thing? They are pretty neat and I was going to get one just for the novelty haha.