I would suggest talking with the hardcore morning slalomers first.There is a good chance that they alreadt try or thought about it and they could help with the assosiation if they have been around the lake for some times.
You are gonna need permits for sure and chances are someone around the lake will be against it .
I always talk about waterskiing being a sport not an activity and the boat being a tool for it like like lifts at snowski station.I think it help peoples understand what you are trying to do.
I did put a course 10 years ago on my lake and it is still there today(Just got back from skiing actually).Now,residents are use to it and don t mind at all(great spot with no houses nearby).
No permits needed here.