3d printed dash bezel.
I'd find a shop would could take the 3d printed part (all cleaned up, sanded, finished smooth) and make an epoxy mold from it for injection molding.
Tooling should only be a few hundred bucks and setup would be a few hundred. Each part should be way under $20 finished and no sanding needed.
An epoxy mold can last a few thousand shots too.
I believe there's at least a few larger "prototype" shops similar to quickparts or stratasys who offer this as a service too.
Something to think about if you find decent demand for the printed version.