You can, but shouldn't glue the window back to the top. The glass is attached to the fabric using a vulcanization process. If you add glue you add extra weight and the rear window portion will sag.
I replaced the rear window piece myself (after doing countless hours of research) and it was very successful. You'd never know the back window isn't a factory piece. And for the record, I have ZERO experience working on ragtops.
I made a write up after I did it, if you want to try tackling it yourself. https://ls1tech.com/forums/convertib...placement.html