Tablets seem to have a lot of cases/keyboards made to fit them for a lopsided laptop-ish experience, a specific Microsoft surface tablet had a GPU in it's detachable keyboard, and Samsung Dex is pretty cool but it's only the ability to plug your phone into a monitor, Logitech K480 is interesting.
But I've never seen the absolutely cool and based thing you just described.
Tablets seem to have a lot of cases/keyboards made to fit them for a lopsided laptop-ish experience, a specific Microsoft surface tablet had a GPU in it's detachable keyboard, and Samsung Dex is pretty cool but it's only the ability to plug your phone into a monitor, Logitech K480 is interesting.
But I've never seen the absolutely cool and based thing you just described.