I did a Palomino that had cardboard as the backer. I scrapped all the cardboard off and used 1/8 inch plywood to re-mount it. Used a standard paint scrapper and was very careful not to damage the glass. Glued the plywood on the camper and then the fiberglass onto the plywood. It will not bend if you mount the glass first. Tried that first then had to scrap new wood off the glass, what a pain.
I didn't try the de-lamination epoxy you asked about.
The sides of the nose were a bit harder as they were laminated plywood to start. One had about 3 feet of de-lam the other only about 10 inches. I gently removed all the plywood back to where it was solidly bonded except 1 thin ply (about 1/16th inch thick) which was still tightly bonded to the glass. Used water to soften the plywood and allow me to get any that wasn't already de-laminated off. Propped the glass out away from the insulation and frame to dry good for about 5 day. Then cut 1/8 in. plywood approximately to size and re-laminated.
Tried several different adhesives. The only one that worked for me was polyurethane. If that's what you use, don't forget to clamp it tight, it builds quit a bit of pressure when curing. It should also work if you decide to use Aluminum for the backer as it is an anaerobic adhesive. Wear rubber glove, it is hard to get off your hands.
I learned a lot and although it was a major undertaking (6 weekends) I kind-of enjoyed it. It turned out great. No one could tell it had ever had a water problem.
I made pictures to post here but didn't find the time.