dunno,,, but they could share the gate money, or pay them an average points money, (elite league riders, ride for less, and national league get more, and so on),,, if the 'superstars' don't wanna be involved for less money, tell them to get on their bike, literally,,, something's gotta change, according to some folk :-)
you could call it the 'BSPA Super-cup',,, or summit,,, all the riders involved would be on equal points money, if some don't want to represent their club,,, then we will all know who not to invite back to ride for us again :-(