After trying many different solutions, it turns out that Gnome not only runs well on my Raspi 4, it's also the most usable solution for a small but very wide 1280x400 touch display.
Actually, there's one other thing I already planned the last time. Some ref sheets have bottom-up and top-down views to show the fur pattern very clearly, and I'm definitely going to need this now
This was only the first step in this project, though. Next I'm going to work on some scenery for the overview page so it isn't just a flat background. I had this idea since the I worked on my very first wyvern ref sheet, and now I think I can finally pull it off.