Buzz34/Laggie,
Thanks for the feedback.
I know that it's not what you want to hear but please bear in mind that operational requirements are often far, far removed from wannabes' aspirations.
If the company has gone to the effort (and especially the cost) of training you to operate a particular aircraft in a particular way (ie multi-crew, AS332/EC225) then it is very unlikely that, in the short term, they will go to extra cost to train you on to a different aircraft in a different environment (ie SPIFR EC135). I'm not saying that it's impossible, just very unlikely. (I don't want to sound patronising but are you even aware that a multi-pilot IR is different to a single-pilot IR?)
Also please bear in mind that there will already be a queue of offshore pilots in front of you who would also like to come onshore. I imagine that seniority will get preference.
Best of luck with the process though.