You might check with someone that does gold plating of auto emblems on the auto. They have a pen with a tip that can be used to hit a small area and plate it.
Just going to chime in here. I am a chrome electroplater and a former jeweler.
Try playing shops or maybe even trophy shops.
I know you can buy kits, that you can do your own plating.
Caswell playing sells the kits... https://www.caswellplating.com/nickel-crystals-40-lb-20-gal.html