RCflyerDan, you and MajorT are each learned aviation persons. Since there is no absolute solution to the 400 ft ceiling problem, I suggest that any RC Club
wishing to keep out of trouble simply move their facility to outside the 3 mile (better if 5 miles) distance. You and I well know that there are many Civil Aviation "Airplane Drivers" (Pilot ?? ) that have no concern for any RC activity. Even in professional aviation, you know as well as I do that there are many "pilots" that have their heads glued into the cockpit. Even as a second officer back in late '60s-early '70s I know that I called out many outside "intruders" while the Capt. and F/O were glued in the cockpit even on clear days. Today's pilots, with all this computer crap flying, definitely are simply flying - in the Simulator - as when they are trained. My son, now a UAL F/O, but also a retired Lt. Col, USAF, sees a lot of that with current Captains mostly younger than himself.
IMO, any RC Club that wishes to not get into any problems with 1:1 scale, will keep themselves out of any area where such may happen, especially in a 3 mile distance from a public airport. Regrdless of the situation, RC will never win in any contest with Full Scale. []