If I understand correctly, your going to drill the hole from top to bottom.

I quit pinning CA hinges some time ago, but, if I was going to pin them your idea might be something I would try before inserting the pins, IF the surface was uncovered. Most of the time I have already covered the control surfaces and I am not inclined to drill a hole in the covering after that. I think there is a real likelyhood that the CA would go on thorugh the hole and get all over the surface.

If you use the RCU method, there is probably no advantage to drilling the extra hole.