Try and find a local "plater" and have them stripped.
You will have to remove all, or and steel, and plastic on them if any.
You can polish them out, or have them re-anodized.
Or polish, and have anodized for a shiny finish.
I have it done all the time to other parts, like the silincer in my bike picks.
Or you can bead/sand blast them to remove the ano.
But having the plater strip them is the eastie way.
Good luck!!!
O!
Paint will hold in heat!!!!!