I'd potentially be interested in this too.
It's been a while since I've been to Frankley but the thing that puts me off racing 10th on an 8th track is, as mentioned already, the extra bumps - but if people think it's okay then that's good. The other thing is big jumps without any downramps. Rallycross can take these no problem but having experience on other tracks, 10th cars don't take them half as well.
But my glass is half full rather then half empty