I totally agree with all this...WAY too much to change over. Believe it or not, it doesn't seem all that hard (at least on TV) to cut/replace the roof on a hardtop. I mean, it's not "easy" & the big deal is getting everything trimmed & lined up perfectly before cutting/welding, but it can be done. PLUS, a roof should be reasonably easy to find since that part is rarely replaced.
What's bad on yours? Does it just need some patches? Is it rusted dead center so you could just put in an aftermarket sunroof? Could you find & graft in a factory sunroof from a Cordoba or something? I know I'm shooting from the hip here...just thinking.