I seem to remember it's quite easy to demonstrate in an R22, from the hover you put the stick forward a little bit and keep it there, you will get flapback, push it forward a little more and the aircraft will start to accellerate and get ETL, you get inflow roll (to the right), caused by transverse flow effect.
Then you had more luck than me: I was also looking to demonstrate the effect before the main rotor flies through its vortices and found any effect indiscernable; dwarfed by the massive roll to the left as the tail rotor flies through its own vortices. It suddenly shed light on why two senior instructors at Bristow had different opinions on the direction of roll: one had thousands of hours in Robinsons.