Yeah, it’s been quite a bit of guess work. Gtk/Kvantum themes are both Nordic-dark, then with the right gtk settings everywhere and compiling a few bits (cursors, Xsettingsd) and installing all the flatpak portals, with the right variables as well as all the Kvantum flatpak runtimes it works consistently across GTK/Qt/XWayland apps, including the cursor.

All my installed packages are also there under doc/apkovl. I installed my cursor/gtk themes to /usr/share as I compiled them but I’m sure they’d work in /home.