fishboy,
If you were ever to fly actual IFR, your employer would then be putting you through a type rating and NOT an instrument rating.
well when I converted to the S76, the conversion course was scheduled for 12 or 13 hours total time, it most definitely was not just a VFR conversion, we spent more time on instruments, and at the end of it I did an LST + IR, as the IR is type specific.
i.e. you need to do IRT on every type you intend to fly IFR
regards
CF