That will work ,
On the 230 wing there are holes in the ribs ,
You don't have to take the wing off ,
At the wing root end ,after drilling a hole in the skin where you position your lights ,you'll
Have to drill a small hole Into the end rib , as this is the only solid rib .
Getting the string down through the wing is not difficult , you need somthing long and thin to attach the string to .
I've joined a couple or three lengths of dowel , but you can use any thing stiff .
Check photo of wing rib holes
This is a 250 wing , the 230 wing is similar
IDE go down the leading edge as there's no restriction all the way down .
Cheers