Triage
Perhaps one of the best ways for multi breed kennel clubs to deal with dog shows is to devise fun events, and register as "pure professional" litters from all event degree winners who were bred to other event degree holding dogs.
For example: If a boxer, who has an advanced obedience degree, is bred with a Doberman who has the same advanced obedience degree, their puppies could be "First Generation Purebred Obedience Dogs".
When a dog earns his advanced degree, and both of his parents and all 4 grandparents have the same advance obedience degree, then he should be entered into a stud book of "purebred obedience dogs".
I believe it would work best if all dogs could enter, fixed or not, purebred or not, and only earning the degree is required (not based on competitive ranking).
Then after this takes off, let BREED shows charge more to enter; if your going to go for snob appeal, you might as well go all the way.