There's a couple recent products that hit similar niches:
GPD Pocket: https://www.indiegogo.com/projects/gpd-pocket-7-0-umpc-lapto...
GPD Win 2: https://www.indiegogo.com/projects/gpd-win-2-handheld-game-c...
Ockel Sirius A: https://www.ockelcomputers.com/sirius-a/
I have the original GPD Win, and it's a surprisingly competent PC for being roughly the size of a Nintendo 3DS XL. The keyboard is terrible for typing on, but that's kind of expected with its gaming focus.