Thanks Ramp and Tux for your suggestions. I can only ask for a volunteer, I'm not at the 'appointing' stage in our club yet, and doubt if I will be.
A couple of the formulas I've seen seem a bit complicated. I had something simpler in mind, like what one of our members suggested. Grade players A, B and C etc based on their handicaps, and they can only enter the A, B, or C tournaments they are graded to.
In credit tournaments, the playing field would be more or less level and who gets the winnings shouldn't be an issue.
By the way, I should have made it clear in my initial post that it's in credit tournaments where the problem is.
I'll keep you posted.