Your question is hard to answer. rebuild a new lens is a bit complicated. you can gently try to stick some kind of material in sheet or grid that you like and then trim the excess with a cutter.
But I recommend the same as P. The best solution is that you paint your lenses.
I would do a little heat with a hairdryer. Carefully take off the mask lenses. after some sanding with very fine sandpaper. and then airbrush or spray paint. in supermarkets you can find plenty of metallic shades. spray paint for cars
I hope explain well i have a very bad englihs
