As it turns out, I've since migrated away from X11 entirely, opting to use Gnome Shell on Wayland. At the time of using sessiond, I paired it with the Awesome window manager and mainly utilized a browser and terminal. I used lxappearance to set Gtk themes for the few relevant applications.

I added a demo video!

Good idea. I'll add one soon!

Thanks :) It was a fun project!