I have a lot of sympathy for this position, and it makes me wonder if high school distance running would be better off if "club teams" existed, as they do in high school swimming. Then, the kids who want to train 12 months a year with Brosnan could join his club team, and the other kids who are either unwilling or unable to run 70+ miles a week and go to a month-long summer camp could stick with the school team.
I know that in high school swimming there can be big conflicts between the club programs and the school programs, but perhaps US high school distance running has now reached the point at which high-powered club teams need to be considered as a viable option to the school team. Isn't that how it works in the rest of the world?