if you want tactictil feedback you could use a thin membrane to lay over the keyboard that has raised edges for the keys, it could even be soft so you have to press down on it in order to do a keystroke. Then when you want to changefrom the default keyboard display either swap out the membrane or remove it. Something like the Zboard only your only replacing a thin reuseable sticker.
So, um, you haven't used mechanical keys, have you? I can touch-type fine on a flat rigid surface, it just isn't anything like the feel of a mechanical board. I spend way too much time in front of one of these machines, so I'll have a little luxury in my interface devices thank you very much.