Does it need to be vinyl? If you look into a supplier that also does interior stuff etc then they should stock a printable wallpaper with metallic/shiny finishes. Ours does and it looks great! Not cheap though.
naturally if this is cut lettering just ignore me. But I’ve found with jobs like these if stuff is coming off, it’s usually the paint/installation instead of the actual vinyl. True what they say though, throw enough s*** and eventually some will stick lol