>>2289169The best no-sew option would be to get a KAM snap kit like pic rel, and a bit of grosgrain ribbon to make a snap-able tab to relieve any pressure from the zipper.
Just make sure to move a bit of the insulation out of the way and the snaps will install pretty easily.
Also, make sure to singe the ends of the grosgrain when you cut it.
You can get a lot done with some KAM snaps and grosgrain