Rotorbike,
To add to Nick's answer on US stuff, while I could gain all the time I wanted with Capt Street, etc. and claim those hours, it would basically be meaningless (IMO) unless it consisted of my doing the starts/shutdowns/emerg procedures, etc. It's great to log the Turbine time, but everyone out there would know it was just that, flying it. Yes, it builds hours, but that's all.
(I'll allow that I don't know what he will allow you to do etc. But stand by my assertion of what is important about the time logged)
I would say that to me, if I were to do that, I'd get that time in the air, then get the factory school out of the way too.