Vantage Aviation in the UK operate a Longranger G-OSAR for single engine Instrument Ratings. It is certified to provide SE IR training but not sure what permissions / limitations it actually has to operate
October 26, 2017 Helicopter Single Engine IR approved
Vantage Aviation Limited has been approved by the CAA to conduct Single Engine IR courses in the UK on the Bell 206 Long Ranger – G-OSAR. The aircraft is unique; it was built by Bell as a IFR helicopter and is capable of conducting IFR training (NDB, VOR, ILS) and most importantly is also PBN compliant.
The aircraft is fitted with a 3 axis auto pilot and dual electrical and instrumentation.
I think a mixture of Single Engine Training followed by ME upgrade during Type Conversion is a very efficient way of training. Considering the cost of a ME Instrument Rating, its hardly surprising that so few aspiring pilots can afford to go forward with the training.