I think you should do it as an Invitational Event and open it up to anyone that's ever been an F1
Think of the likes of Jamie Booth, Craig Drescher and obviously more from the EPO area like Kevin Moore, Richmond Rogers, maybe even some others like William Mitchum, Ben Sturnham - i know for a fact some of these guys would love the chance to get to race at a decent one off 1/10th meeting??
Plus don't forget all the guys that have gone off to race 1/8th (Sloppy, Dave Bailey) plus the others that are now not racing 1/10th any more like Cree for instance!