Once you setup the emulators (which does take me ages sometimes), the only problems I had were Gamecube and Switch emulators not letting me open emulator options in game mode without things getting fucked up.

But she probably won’t care, and I probably needed an extra 30 minutes to get it fixed, which’d be your problem. I grabbed NSO on Switch 2 because the setup was a pain and I am fine with paying ~4€ a month to skip it, but Steam Deck sounds better for you. (And is also just better in general)