Why do you think so? My wireless Samsung Buds are about 2 years old and they are working great, as if new. Meanwhile when I had various wired headphones before that, 2 years was about their top life, mostly because of the cable getting damaged, which you can’t replace anyway. So the argument of battery not being replaceable is totally irrelevant for me, and I think for most other people as well.

You might have some luck with a controller, using only a half of it, and re-mapping all controls there. Steam Controller might be great since it has touchpads. That might make some mouse-requiring games playable.

Using only keyboard, damn that’s difficult to find something, haha. I think these might work, just going by my memory: FTL, Toki Tori, Undertale, VVVVVV, Braid, Dome Keeper. Basically that kind of simple 2D games. Then almost any racing game.

You could also try some eye tracking solution, can’t help with that though.