If you can make it a soft mix changeover between rotor differential and aileron action from about 70 degrees through to about 30 degrees deployed. In playing with flaperons on a sailplane I found that 30 degrees of flap was the absolute most you could use before the ailerons started producing so much adverse yaw that they became totally ineffective. But in your case the flaps are being "blown" by the rotors so this may not apply to at least the outer wings. Either way the changeover should be a smooth transition over quite a range to smoothen the transition as airspeed comes up and the normal surfaces can take over. My angles may need some fine tuning as the closer to level the pods get the more yaw you'll have as well. In any event I suspect avoiding a sudden switch over would be a good thing.