I had the same problem. Some of my windshield hinge nuts were stripped. When I researched the issue, a common solution was to drill out the nut, and use simple nutserts. Others would cut off the entire corner to access the inside, so that the bad nuts could be removed, and new nuts welded on.
I used a different approach. I tilted the windshield forward so that I could drill a hole just below were the hinge nuts were located. The hole was just big enough so that I could insert a new not ON TOP of the bad nut using some needlenose plyers. Then simply used a longer hinge bolt. It works, and only required minimal effort