Or even more dodgy, ...and even more expensive...
You could just do what my mate does to his R6, and gets his little camcorder, and tapes it round-and-round-and-round his pillion seat, using a matching-R6-blue electrical tape.
So it looks like a really really badly made single seat conversion. Worringly no one has ever stopped him yet!
Hey presto, lap times and good home videos!
Vx