Rear window rust repair without welding

Make a patch bigger than the rust hole and use rivets and cover with sheets of fiberglass.

Can I rivet inside the window frame and still get the window to seal?

The more I look into this, if I do the prep and find somebody to do the metal work, then I spray the primer and block...a $500 trip to Maaco might then be the answer.

I'm sure I'll come up with 100 other ideas between now and when this actually gets done.

First step, really, is finding a place to do all of this!