To be honest, I haven't worked up a complete solution for Force-users. Largely, though, I would model it very closely to what exists for magic in the DFRPG system. Including Thaum for the more complex things (plenty of that in the cannon). I would expand Evocation a bit, though, to handle certain things like Biomancy and allow for more physical related uses.
The Aspect route is easy enough to do as both the characters already have those aspects. Hmmm... will have to think about this some more. Thanks for the new idea/approach.