Stick with the correct descriptions, otherwise people will walk away with the wrong idea on a very dangerous situation.
You can't demonstrate VR, because the pilot cannot get out of it!!!
What is demonstrated is Incipient VR where the symptoms begin to show (vibration, high ROD developing, stirring stick etc). It is only during this phase that the pilot still has control of the a/c.
If the ROD gets excessive (4000+) and the stirring of the stick does absolutely nothing, the a/c starts to nose down, up, yaws, then you have forever lost control of the a/c
Starting height is your saviour. I wouldn't demonstrate IVR below 4000' personally because it gives a safety buffer for most things to go wrong.....
Dodgy doos...............................