maybe a bit of a daft suggestion... but could you not fit a small orange LED strip to the top of the wing mirror? I was looking at the carbon style mirrors and there seems to be enough real estate on the top of the mirror to fit the LED strip, then just route the cable inside the mirror?
Just a thought?
Something like this
http://www.pocketbikesunlimited.com/...mirror-set.jpg with this fitted
Rapid