This got my attention because I came very close to doing this a couple months ago. I found somebody on ebay who could custom stamp whatever letters/number you want and provide a 2-sided vintage looking plate. I was going to make it match my vanity plate.
In the end, though, I decided it wreaks of "Big Brother" (old European requirements for excessive markings -- kind of like the preposterously GIGANTIC number plates so many countries require now. Yuck!). Besides, the idea of a "Bobber" is to remove parts and mass, not add more. That's why I am reluctant to carry out my tank shifter / quick shifter fantasy. Cool though it would be!
-GPz