Honestly I don't think it's worth the work have to do for it. Unless are replacing calipers and have clean ones off can paint quickly.
And on most rims don't even notice them. The ones on my M3 are red, only when I take off the wheel do I see it, and say to myself "oh cool, I forget those were painted."
I'd maybe look into those eh, I guess are brake dust covers, they essentially just clip onto the caliper, indirectly giving the illusion of bigger/painted calipers.