I was looking at the bumpf that you get with your melville membership stuff, is n't there a few racers from other classes doing the supermoto class as well, namely that Torquill Paterson who I think is a bit handy on a bike,
I think you'll do better than you think, for a few reasons one being theres no off road section and your used to riding on tarmac, secondly you've got a 660 and east fortune is quite a fast and open track,
Thirdly with a swona exhaust and set up your bike will be faster still, so really all you've got to do is make it round the corners at a reasonable pace and let the 660 do the rest!!!!!!!!!!!!!!!!!
Sunny