hahah unlucky, although you broke the law and you know it... im all about getting out of silly offenses such as these!
fight it on the grounds that it is not illegal to register any car based on your licence conditions... eg you could register a lamborghini if you really wanted too... just cant drive one,...
and that they did not specifically witness you operating the vehicle... so therefore no laws broken
dont like your chances, but who cares, give it a go i say,
having said that, i got caught riding a gsxr-750 on my bike restirctions the other day, everyone told me... dont worry about it... its just a $109 fine.. no points
boy were they all wrong lol