Plating alone won't fill the holes. Small pits are sometimes repaired by stripping, copper plating and buffing down the copper plate to smooth. Sometimes that is repeated several times to build up copper. The issue with that is in the process of buffing the part over and over, some detail will be lost. Usually, the plater will settle for "good enough" compromise and you will still have some pitting but the details aren't completely buffed off. . The pot metal chrome around my convertible boot was done that way and it looks OK, but they were also in decent shape when I took them in.
Pot metal restoration is a real specialty and expensive. Chrome is stripped and pits are ground out and filled with silver solder and ground or filed flush. You have to be really good at that as pot metal is very unpredictable and its melting point is very low... and may even vary part to part. Then it's copper plated and buffed, and again, that step might be repeated several times. Final chroming and then you dig really deep down in your wallet... I mean real deep to pay for it.
I would bet those parts could end up costing $1k each or more. Probably more... That would have to go to a specialty shop and I'll bet it would be months before you saw them again. If you wanted to look at that option, find some better parts first.
The alternative might be to look at filing with JB Weld and having them powder coated with one of those chrome lookalike powders. The problem is that it doesn't really look like chrome and that makes any real restoration of those parts more expensive because now you have to remove the powder coat and the JB Weld. The best it would look is like polished aluminum.
NOS would probably be hard to find, and even then, might have "pops" in the plating as that's just the way it goes with pot metal.
The best way would be to have them recast in a bronze alloy. That would involve $$$$$ to do that right, but you could probably resell a few pair and never come close to breaking even. LOL.
