If painting your calipers is not desired, and caliper covers are of interest, then at least try metal covers (MGP Caliper Covers). Unlike the plastic covers that at least incorporate contours and fake bolts to make look more "realistic," the metal covers look more heat and chemical resistant, but lack the contours/detail.

IMO, I think an all-black or blue (satin, not gloss), all-satin silver without the painted on bolts or emblem would be passable and not draw much attention as being a knockoff. Red and yellow covers get close(!) looks, and these close looks translate into discovery that calipers are covered and not authentically painted, causing... unfortunately among enthusiast...but the abundance of casual observers likely won't give a "shoot"!

It also depends on the type of wheel you have. If you have an open 4- or 5-spoke pattern that shows a lot of your braking system, then a cover will look noticeably like a cover, but if you have multi spoke wheel (e.g. Beyern multi) that casts shadows on your brakes, then it might work.