Out of curiosity, what's wrong with the fly 18 ones?
Several of the regular I play with have talked about how we'd like to be able to play on ball golf courses, and brought it up with the local course pro. He told us that he'd spoken with at least one course, and their big issue was they were worried about damage to the greens. That's easily enough solved--just have the basket in some other place.
I think if you're serious about it, the best route would be to try to set up a temporary course and have it open for a weekend or two as sort of a trial basis for the course. I know it might be hard to find 18 decent temporary baskets, but it'd be good to have some sort of test run before anyone makes any kind of commitment. And I also agree with what roadkill said about having enough people that would be willing to do it, and acting and dressing appropriately. I personally would love to have that opportunity, I'd still spend the majority of my time at the good ol' free courses, but being able to play on a nice manicured ball golf course would be a nice treat to myself every once in a while.