While I’ve also been interested in similar such systems, the author can accomplish one of his goals — the mechanical keyboard one — with a fairly-traditional laptop setup: he needs one of those hybrid laptops that has a screen that can swivel to act as a tablet. Then he just converts it to “tablet” mode and uses it as a monitor, without the keyboard sticking out at him, and he can use whatever keyboard he wants without the laptop keyboard being in the way. Does limit the laptop hardware options, though.

And doesn’t buy him the other stuff that he’s gunning for, like more customizable hardware or a screen with a larger FOV or such.