i recently did some wheels with rustoleum "implement" spray bombs, over their etching primer on the bare [blasted] wheels.
i used "massey -ferguson" gray. it turned out really nice.
i was surprised that it only took two coats per wheel [the face only] and i didn't use up one can !
the back sides and the barrel of the wheel the tire rides on, was painted with red oxide rustoleum and their regular black spray bombs.
i can't remember just how many colors the "implement" spray bombs come in, but if the other colors spray out as nice as mine did, and you can find a color you can live with, that may be an alternative.
i know regular automotive paint can stand up to engine heat, so i would think a quality spray bomb may do the same.
i think the secret in the spray bomb comment is the word "quality".
unfortunately, someone has to try it to see.
i am seriously considering using the "implement" paint on the 440 and 727 i have almost ready to install into my charger, so i may end up being the one to find out how it stands up.