I'm not imagining much compromise on the tablet side - at least not more than Microsoft's Surface keyboard connector. I'm thinking of thin tabs attached to the hinges slotting into the tablet body.

It would still be pretty compromised as a laptop, but better in that role than current tablet keyboard solutions.

As I say, software differences aside, my experience with the current magnetic Apple keyboard and the touchpad seem pretty good. I'm not sure a probably relatively weak mechanical coupling would be better.