You won't change the good old boys. They are plenty content and have no reason to change.
You will not be accepted as a Big Dog to hold your own clinic/school. If you tried it would be you and the few complete newbies.
Better, would be just continue working and doing a great job. You will become notice by the coaches and soon you will get the good games while the old boys fade (probably several seasons/years). Not a very acceptable answer to you, I'm sure.
Even if you hold a clinic and invite a Big Dog your attendance will still be limited (more than if you held it yourself). You still won't get the Good Old Boys - they don't respect the game and they don't respect good officials. They are there for the money, the commradery with their buddies, the sunshine, perhaps the positional authority... and little else.
Not sure there is a really good answer. Good Luck, however you tackle this turtle!