How do I repair delamination filon? Arctic Fox 990

Our 03 has the same typical? front cap delam, around the front window.
It was from either the clearance lights or window leaking I presume and was well sealed wen we bought it (goobered up though).
I pulled the window out and nothing was/is rotten, but the fiberglass is too stiff to glue back in place and cant realistically build a jig easily to put significant pressure on it.
IMO, not worth the time or effort, it's only cosmetic in this case.