Yep, double the ribs. Might even be OK stock if they are thick enough. Let the wires come out the center of the wing where the single servo cutout would have been (and probably is). Carefully make a small hole @ 3/8 Dia centered in the rib between the fwd and rear spars in each necessary rib. try to make neat holes. Run the extensions before covering and tie in place with thread of plastic tie wraps and leave them there forever. Excess wire can be tucked away later.