In my experience, high temp engine paint holds up better than the brake paint kits that they sell.
What I've done in the past is used tons of brake cleaner and a wire brush, and cleaned them. Afterwards, use some strong degreaser, and clean them again. Rinse with water once done, use a heavy grit sand paper and hit the calipers just lightly enough to break up the surface, primer (several light coats, no heavy coats), paint(again several light coats, then clear(several light coats).
If you wanna do a little extra, pick up some decals that say Bonneville, and apply them while the last coat of paint is drying. Then put the clear coat over it. Add'* a little extra to the brakes.
2000 Bonneville SE