I wonder if there's some kind of plastic trim that's about the same shape which you can paint silver? Hardly ideal, but better than nothing.
Also campers often have all kinds of oddball metal trim too, you might check with a place that repairs them, they could actually have what you need on hand or at least be able to point you in the right direction. The same also goes with places that might commercial cabinets, counters and such, that trim looks a lot like something you'd see on the edge of a fast food place's counter.