As long as the bottom skins aren't riveted on, you will be able to do just about anything you want to make facilities for wiring.
On my RV6, I installed a PVC pipe for the length of the wing. In my case, I drilled a suitable size hole in each rib and then slid the pipe into the wing. Then I got a connector and cut it into two rings that would slide over each end of the pipe and glued these on to hold it steady in the wing. When I sold my RV6, it had about 900 hrs on it with never a problem with this set up.
Some folks just lay the pipe in the lightening holes and use a tie wrap on several ribs to hold it stationary.
I used 1/2" pipe and it accommodated landing light, position light and strobe wires with no problem. It would have been able to hold more. In fact, I left a string in the pipe so I could pull more wire in if I ever needed to.
You could also use snap in bushings in the ribs, but it would be more difficult to work on the wire after completion, if you ever needed to. (If you were going to go to the trouble to drill holes in each rib for the bushings, I'd recommend just putting in a conduit.