You can probably encase a Raspberry PI with a battery and a touch screen, micro SD cards can go much higher than 16, and install Linux. Keep in mind that the Linux touch UIs aren’t really great imo, the best experience I’ve had so far is the steam deck.

I play StarCraft II regularly, have played Diablo IV and just started WarCraft 3 recently, all without any issues. All you need is proton or install steam and add a non-steam game.

Do you have any interest in relocating outside India? You seem to have a good domain of English and softskills on top of some Linux. I wouldn’t mind taking a look at the personal projects you mention