Teeth above the headlight, and swooping out around the mirrrors. Eyes on the windscreen. A tail number (his old race plate?) on the luggage, and a white star in a blue circle. Maybe even a tiger logo.
I can get waterproof vinyl that will print on my home printer, and I can get measurements from the bike when he isn't looking. Voila! It would take about ten minutes to do it on the street, once the prepwork was done.