General Formulations Brushed Aluminum Vinyl
I thought of that too! There are ways to do This... But depending on the size of the order.... It will be more expensive, and more work than it might be. I love to brainstorm the possibilities, but then you crunch the numbers, and outsource. Depending on the client needs, and reality.
That said, I would print with the UV flatbed and mount to the substrate , which has to be cut.. Some time involved, pricey materials, capability dependent...
If the op has a flat bed cutter or CNC, it might be doable.