The local car club up here has a Tri-Challenge with two other clubs each year.
It started as a way to support the two smaller clubs and has grown in numbers each year with a round at the three clubs circuits
Maybe SAU could do something similar with say a Toyota, Subaru and Mitsubishi club to boost numbers and help with costs
Four rounds with each club hosting one event say a Wakefield day then a drag day and a hillclimb and maybe a standing mile or klm at an appropriate location somewhere. Points awarded for overall places as well as classes with points also awarded to each club based on members results with a winner at the end of the year.
Drivers must compete in the same car and (maybe) class all year to be eligible as this would stop those with money spending big between events to score a win
Could also maybe have a combined cruise/meet at the end of the year for prizes etc.
This way the cost is only for running one event and you should get numbers at each event to make a profit for each club
Just a thought anyway