I'd reckon a Gordian knot-type solution is required. Yet I can't help but think that there needs to be some sort of reference that will differentiate a group that is specifically aiming to protect ancient remains, from other groups who may be aiming to protect more recent remains, industrial archaeology for instance.
Maybe somebody out there knows how to get a reliable vote going?
Answers on a postcard to the Red Lion in Avebury or something?
The spirit of Reg and his Judean pals is still about.