Regarding Wallpaper Engine on KDE Plasma, since I switched to Linux a few days ago: here is the repo for the one KDE Wallpaper Plugin i found that worked fine on Nobara. Subscribe to the Wallpapers in Steam, point the plugin to the steam library, done. just know that there are some wallpapers not working yet, which makes plasmashell crash, but no biggie, change the wallpaper and restart plasmashell again.