west system with structural filler would be my suggestion. You could use some chopped glass as well but I think the structural filler would be fine. But then again, there are smarter than me engineering types around that could give you a little more info.
here is what I would do- drill the hole- not a very big one though. Put a piece of tape over one side. Inject west sytem with maybe a little structural filler into the hole to make sure it is all in contact with the surrounding glass/etc. You could then add more structural filler to the epoxy making it almost a paste and put it in there.