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I would use the appropriate size Pop Rivets with washers...........so long as the fiberglass isn't split out at the hole. Then I would repair that first and then do this. Larger washers will spread out the load. I would also use some adhesive under that to add to the strength of the bonded area.
Hope that proves helpful here. Please attach a photo to your posting so I can see this if you feel I am not "seeing" your issue correctly. All follow ups are included in our fee. R.J.
I think he can do this without much trouble............but, get back to me if he has another idea.