Dennis:
Sadly won't be coming to UK for 20th May - some other time perhaps?
My preferred method of demonstration for VRS incipient stage is - start in level flt at 60 knots, downwind (and this only works downwind). Reduce power by about 20% of power for level flight (not % torque, % of power being used) and decelerate maintaining altitude.
The point is to show the symptoms - and they start as the airspeed reduces through about 15-10 knots - low frequency airframe buffeting, followed by uncommanded pitch, roll and yaw, and if power is increased, a possible increase in rate of descent.
The aim is to make the student aware of the symptoms they'll see and feel and hear in the cockpit and like stalls in a FW airplane, stay away from them, or recover at the first sign of them.