A combined club championship event could do what your after Metro
A race at KOCC on Sat (tt ?), then another on Sunday with the vets (scratch ?) then next sat a points race at KOCC then a Sunday crit at steel river with HD and the overall graded champion based on the points from all races.
The grades would have to be consistent over all the clubs.
Something like this would get well supported will all local clubs (inc ADFC).