In this case there was no original ... we "extrapolated" a design from period correct examples.
Getting a chrome like finish would be a challenge. I have seen a guy on YouTube doing some beautiful electro plating on plastic by using a filler primer, painting with a conductive paint, and plating over that ... but he was using palladium I think ... not exactly a cheap metal.
Original finish on most of these was pretty freakin bad .. so yeah, like you suggest, a combination of paint products would probably provide a suitable finish. I think by the late 70's early 80's many had gone to a colored or painted plastic of some kind.
On 80's and later cars with lots of plastic badging ... 3d printing could be an answer to hard to find parts.
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