If you go back to the movie Top Gun and look at some of the close ups of the aircraft you'll see the ailervators in action. On one shot in particular there is a LOT of aileron action in the elevators.

I suspect that as long as you're willing to use the dual rates often to affect the ailevator mix as you move from low to high speeds that the ailevator option may work.

If you're putting a lot of effort into that model it may be worth making a 25 or so sized "hack" test model first.

A lot of that fly by wire stuff refers to the full sized need to move LOTS of surfaces in coordination. That and a fairly rearward center of gravity to enhance the maneuverability.