Veeany
Demonstrating incipient VRS is no more dangerous than demonstrating stalling in a FW airplane. PM me if you want specifics of how to demo.
And VRS can happen any time the downwash velocity equals the velocity of the airflow coming up into the rotor. A badly carried out approach with a large flare and a pull on the collective at the wrong time can do it.
My view is that VRS often doesn't get blamed when it should.
I looked at a Lynx accident many years ago that had VRS written in bold letters all over it and yet the Army Board of Inquiry didn't even consider it.