Yeah, they can be re-plated. Local antique shops are usually good sources of small-parts plating outfits. However, I've been told that once you remove them from the fiberglass panel, they are a mutha to re-attach and will continuously come off and rattle.
Reattaching is not that difficult, but it requires custom flat head screws and washers. By this I mean, one would need to drill and tap the back side of the chrome pieces where the crush rivets were and used very short flat head screws (have to machine them down that short) with washers.
Also, Liquid Nails (home construction glue) is excellent at adhering the chrome to the fiberglass.