I'd definitely go with High Temp paint, and you might be able to find a few choices online. Color matching will be a challlenge... but at a couple bucks a can, you can buy a few and test paint something. Here's just one of a bunch of sites I found just "Googling" "High Temperature Spray Paint"...
Caswell VHT Paint

Good luck!

-CT 2003 Speedmaster - 125/42, 17T Sprocket, AI Removed, K&N 2006 Speed Triple 1050