I have wanted an Ergodox* keyboard for a while. They would certainly solve that problem. I think your situation with the different key styles would really bother me, however.
They are different, but similar enough not to be annoying. The feel is different, but the curve is the same and so is the actuating force, so all in all not too bad. Both Dell keyboards. You could just as easily do this with 2 USB keyboards, it's the poor man's solution :)
* http://ergodox.org/