Android phones have mostly been this for years. most of them don't have the physical keyboard built in obviously, but you can buy all sorts of different pocket-sized keyboards[1] that often include a touchpad, and can plug in via USB OTG (which can be a wireless receiver) or through bluetooth. Add an app like Termux and I could (if I had to) live on the thing.

[1]: I used this one for a while: https://smile.amazon.com/gp/product/B07D2BG6R5/ref=ppx_yo_dt...

[2]: This one is awesome too with android TV: https://smile.amazon.com/gp/product/B07WJGSXT8/ref=ppx_yo_dt...