Bob,
I had to think about that for a bit...
If you are going to need the strength of fiberglass over the veil seems like you should go to some "very thin" woven carbon fiber mat.

I'll give you some veil to experiment with who knows ???
Might be worth looking into if you are thinking putting the veil on with dope, to keep the epoxy from sinking into the balsa, when you glass you might be able to reduce the weight and still have it bond to the airplane.