I haven’t come across a FOSS scanner app that comes close to the performance abd features of the popular closed source ones. That’s why I use closed source ones that still work when I deny them internet access. Genius Scan and Microsoft Lens both work that way.

I don’t really bother with emulating Switch on my Steam Deck because my Switch is lighter, quieter, has better battery life, and a far better (OLED) screen. I do love my Steam Deck as well though.

If you haven’t used Linux before, just know that Garuda might not be the most stable. It wasn’t for me at least, I had to rescue it often. But that might have been because I didn’t use/update it regularly enough.