I think this thread has meandered a bit but there are some really interesting points-of-view coming out, which are starting to point towards a common theme:
Class G.
There seems to a fairly widespread view that armed with your +3 Radio of Protection and possibly a Transponder of Truth, you can go heads-down through large tracts of uncontrolled airspace and if you meet anything else it’s their problem.
The primary method of separation is see-and-be-seen VFR, semi-circular IFR. Anything else is nice but don’t count on it.
I’m amazed that people wouldn’t go flying because there might be gliders out there on a good day flying at odd heights and directions. Please do come fly with us but KEEP A GOOD LOOKOUT, like glider pilots do and be prepared to alter course so as not to give other pilots concern. You’d do that in the circuit at an airfield, why not en-route...?