Rick,
What about an extra fuel cap? :-)
The real question is how do you get back the required structural
integrity without creating a high spot on the upper wing skin that requires 5
gallons of primer and 40 hours to sand smooth. Even a 2 BID on the
outside would create a bodywork nightmare. Maybe structural integrity is
less of an issue that you might think. We have fuel caps, speed brakes,
etc. cut into our wing skins already.
I like option C, open and clean, de-core the prepreg, fill and
sand. You might be able to slip in a 2 BID patch and Hysol it to the
inside of the hole with as much overlap as possible. A round hole won't
allow for overlap, but a square hole will. You could paint the inside of
the patch with fuel tank sealer.
Removing the skin is out of the question, since we don't have jigs for
installing the upper skin. You could do a bottom skin "wing rip" and do
the repair from the inside, just like the wing re-closings.
Mike