The pin on hatchlid I bought from Glasstek did not have any holes drilled into it. They leave this choice of where and how many up to the customer.
Do you have any fiberglass experience ?. If so with some time and materials you could make the pin on style a bolt on type. When I got the fiberglass doors for a 73 Nova project it had no provisions for hinges and after adding modifications to them I can open the doors, lift them off of the half of the hinge on the side of the cowl and can remove the doors and set them aside.
How you might do it is get a piece of steel that is slightly larger than the area where the stock lid bolts to the hinges and then mark and drill out this piece of steel to where you could weld in some threaded inserts (like a T nut). Now bolt this piece to the stock hinge with the T nuts holding the steel plate up close to or against the underside of the pin on style lid. Now rough up the area where these two parts meet and then mix up some 5 minute epoxy gel (enough to fill this gap) and then position the lid on the car. Let the epoxy dry (wait about a half an hour to be safe) and then going through the backseat area, remove the bolts and carefully remove the lid and flip it upside down on a workbench or saw horses. Now mix up some fiberglass resin and catalyst and use some fiberglass matting to cover over and bury the steel plate to where when it all dries the lid can now be bolted up to the original hinges.
Now for the latch you can add some steel to it and glass over the steel to allow the stock latch to bolt in also.
It's going to require some time and thinking but I don't see why it couldn't be done.
Jim