@ Jet Ranger: Whatever dude...
Perhaps you should take a second look on your facts, IR (H) training on single engines is still conducted in certain JAR countries and that step in the middle as you say is clearly necessary as we are talking about different category of aircraft.
@ rotarywise: I hear you but those "new instrument flying skills" are type specific except for the generic OEI instrument approaches conducted on any type rating that includes instrument privileges. Tracking VORs, conducting holds, flying arc DMEs are all the same as flying on a S-76, HU269 or even a C172. Using a Radalt in the context of an ARA for instance is a different topic but all the previous stuff is basic instrument flying, all you need to do is get familiar with a different instrument display. Let me ask you this: could you please quote JAR-FCL2 for "only a suitably qualified FI(H) or an IRI(H) may deliver the training"?