It wouldn't be cheap, but you could have a rapid prototyping company make some one-of parts that would fit the mounts on another pocket bike. Then you could easily have decals made at a local sign shop. I have thought about making these and selling them on Buellxb.com, but I don't think Buell would be happy about the trademark infringement.
You could probably get one completed for just under $1000. Metrorp.com could help you with making the one-of parts.
Never raced one but just about broke my ass doing wheelies on one. Don't get me wrong, I love the one that I got, but I sure hurt myself just about every time I ride the damm thing.