Thanks for all the inputs, its interesting how VRS / SWP always seems to incite such 'debate'. The aircraft we will be utilising is the EC135. I think it might be beneficial to demonstrate the incipient stage of VRS (as opposed to loss of ETL). If incipient stage VRS is as easy to recover from as indicated on this thread and on some previous ones I can see no 'danger' in starting IVRS at , say, 6000ft and recovering when the student has clearly recognised how it feels to be in the incipient phase of VRS.
When i was taught to fly planks we regularly practiced spins instead of just being told the theory of them and their recovery. When spin training was complete the emphasis was put on incipient stage spin recovery... recognising the initial phase and recovering before a full spin develops, surely the same can be said of VRS. I agree that the risk / reward of entering full and deep VRS procludes entering it, besides you don't want to scare the student unnecassarily (or the instructor!!)