RE: Not wanting bellcrank
On thinking more about it, I have built several Old Time Stunt airplanes, for example, the Sterling Yak 9, which have leadouts below the vertical CG. I made them fly level with outside wing warp. Not a perfect solution, but they flew acceptably. So, for your application, if you run the lines out the wing, maybe a little down on the outer aileron would make the airplane fly level.