It's obvious the plate is not mounted where the factory put it and at least in the US won't meet federal regulations. I would say you are walking a fine line there, it's not obscured in the pictures but placing it up under the seat is an attempt to hide it. The cop has obviously had bad experiences with sport bikes and went over board (here in Mass that would get you a $50 fix-it ticket , that is have it corrected and signed off by an inspection station and the ticket is retracted) and could have been charged himself with destruction of property by poking a night stick up the muffler.
I would fight it but first I would re-install the proper mount and put the directional signals back on the bike and bring the bike and some photos to court. Claim ignorance of the regulations and show that you fixed it.
I find it amazing that you would even get driving points for a non-moving violation.
