Hello. I released a new version of my theme changing app for Linux.
It adds the feature to (force) set the theme of gnome libadwaita apps without libadwaita patches, among other minor tweaks. Besides that, it can change GTK2/3/4, Kvantum, icon and cursor themes, GTK CSS and some appearance settings across GUI frameworks.
Hope this is useful.
Gnome 47 will have support for accent colors if that’s what you want.