Fantastic. OpenBSD on an M1 Mac Mini would be a great home server. As for desktop, I love cwm on my thinkpads, but macbook touchpads have won me over. That said, if arcan gets to a usable state on OpenBSD, I wouldn't mind sinking a few weekends (and/or crates of beer) into helping with improving touchpad/gesture support. X11 is just too daunting to have me bothered.
I'm really curious what you see to like in this setup.