Glad to see you will go this way. These waivers may serve to a point, but do not clear you of negligence. If a court found some action of yours negligent then the waiver is nothing but toilet paper. Then without some form of corporate wall you would be personally on the hook for everything.
Teaching it through the CC is wise. I used to teach a class on Parliamentary Procedure through our CC. They handled all the headaches and liability, than cut me a paycheck for my time--even handled my tax withholding. Besides it didn't hurt the resume to show myself as an instructor at the CC.