There is no doubt that florescent colors get peoples attention... Hwy workers all wear orange vests, some hunters do. If it wakes up only one SOB before they run over you, maybe it's worth it.
I'd just be carefull that whatever paint you use, it does not act like a solvent instead of a coating
compromising the Helmet surface might not be a good thing.
EDIT: OK, you are nuts
and this is posted in the wrong place....
Seriously... you are not crazy, and it is a "modification" to your CX. So to heck with the interweb polize
Maybe some LEDs along with the reflective paint. I'm thinking of a strobe light on top of my helmet and adding air horns... yes, you may call me "CRAZY"
I'd just be carefull that whatever paint you use, it does not act like a solvent instead of a coating

EDIT: OK, you are nuts

Seriously... you are not crazy, and it is a "modification" to your CX. So to heck with the interweb polize
