Need Help with Vinyl Roof Disease on '72 Scamp

That rear window panel and the surrounding sides were toast on my '73 Dart too.
A good friend of mine helped greatly with welding-in rustfree panels.
This was 7 years ago. I applied a new vinyl top because I got it with the car when I bought it, but as a result of that (lack of prep/proper painted/sealed roof), the rust bumps are already noticable under the vinyl.
Even on the front above the windshield.
The problem with the original style vinyl is the felt layer which provides the grip for the glue.
It also sucks up water and moisture from the edges and possible pinholes, which does not come out again by itself.

When I'm going to fix that (depending on condition) I'm thinking of removing the vinyl alltogether and apply carwrap vinyl with a vinyl-texture.