reattaching cast metal letters with damaged posts.

I removed the pot-metal "AIRSTREAM" letters from the back panel of my trailer as I needed to replace the panel. Despite my best efforts to be careful, many of the little pot-metal posts that have the threaded nut on it holding the letter in place either got completely twisted off, or at least shortened. So I am looking for a clever way of reattaching them. I have seen the recommendations to just use a pop rivet and then paint the rivet, Have also considered drilling through all the letters and using a screw and nut or screw and threaded insert--but figure this might look even worse than the rivet.