I would NEVER EVER trust an actuator to be used on ailerons and the manufacturer has not designed the plane around that. Actuators are way too slow! Go with a "thin wing" servo instead, even if you have to enlarge the opening slightly. There are plenty of servos out there that are small but have sufficient torque, but these are not cheap. Check out the MKS DS6125 Mini or the MKS HBL6625mini for example.
Thomas