ORIGINAL: proptop
You could mount the aileron servo buried in the wing, lying on it's side, so only the end of the output arm was protruding...between that and the linkage, I don't think would cause much drag?
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There you go. That sounds like a plan to me.
I built a Bridi Deception in 1982. It used torque rods that were included in the kit. They looked and felt robust, but I was lucky to get the model back on the ground in one piece that day. These were strip ailerons too, not barn doors. After having to dig them out and replace them with a set of homemades, I got lucky in that the new ones did not oscillate. Why? I haven't a clue. Pure luck. Never again. My models fly too fast to trust to torque rods. Plus the control "feel" of the model is always dubious because of flex, even if they don't oscillate.
Ed Cregger