I've never played Starfield, but I haven't had issues with Elder Scrolls mods on Proton. If the Nexus Mods app doesn't work, you can just download the individual mods from their website, which I prefer anyway.
F-Droid is the more valuable app store anyway. I always check there before Google Play.
I've never played Starfield, but I haven't had issues with Elder Scrolls mods on Proton. If the Nexus Mods app doesn't work, you can just download the individual mods from their website, which I prefer anyway.