I looked into this some time ago, and spoke at length to an executive at one of the big scale automotive plastic platers here in Ontario.
I was attempting to get some unobtanium chrome trim created by having it 3D printed, and then sent to a plater for just such process as you described above. At the time, the issues were that the platers can only get the kind of results satisfactory by having nearly glass smooth parts (near impossible with 3D printers, as some texture always seems to remain), and that the material most preferred by the platers is ABS plastic, and at the time, ABS was not 3D printable. Perhaps that's changed.
Regardless, each part would still require hand finishing (sand and polish) to remove the texture left by the 3D printing process prior to coating with the conductive paint and plating. Unless one is talking big scale production, you can see how that would be not cost effective for a run of a few dozen parts, or even a run of only a few thousand to service a hobby-wide need for a 1 year only trim part, and in my case, far outstrips the cost of having pitted and corroded originals hand repaired and replated.
However, progress is progress, and I haven't followed up or kept pace with any developments in this area, and would appreciate any links you can provide, John.