How easy is it to add donor keyboard and trackpad?

[tllim]

Currently the only option for the keyboards is ISO and ANSI, but I'd prefer not to have so many vital keys under the fn key and larger arrow keys. Something like the Elitebook 840 would be ideal



If I can find a keyboard that fits in the size, how much work would it be to make it work? Is it as simple as adding drivers/remapping all the keys? Or do different laptops use different connectors? I know the touch point is a separate connector but I'm fine if it doesn't work.

The same applies for the touchpad, can that also be swapped out for a donor? I don't like the crappy flat touchpads and clickpads in most chromebooks, windows laptops and macbooks. I prefer the better touchpads most laptops had before and most top end business laptops now only seem to have like this:



How difficult would be to donor one from a different laptop? I don't need gestures (though side scroll would be nice but not mandatory)

Totally case redesign, consider very difficult.