Most keyboards in laptops and tablet folio things are scissor and membrane things as those can be made very thin. The membrane part specifically doesn't lend itself to individual switches that you can arrange yourself to make a custom keyboard with. Same reason you don't really see any custom Model M keyboards. You could do it but you'd have to make your own membrane at least. Assuming you harvest the scissor switches and domes from another keyboard. You'd also have to come up with a custom plate that would work with the mounting of the scissor switches.

So, yes, you could. But it would be a lot of very custom work and would probably cost a lot of money for a dome/membrane keyboard.