misterbonkers, calm down will ya?
liftman, a couple of pointers: The FAA license will get you started on the path to becoming a helicopter pilot but it won't do you much good in Europe. You'll eventually need to get a JAA license. Also: there's really no such thing as a twin helicopter rating or transition in the US. Sure, you can do your add-on in a twin but it would be incredibly costly and serve no purpose whatsoever.
Your fixed-wing experience counts for something but not in the sense that you can just add all your logbook hours together and expect to wow any helicopter operator. If you were authorized to work in the US you could perhaps find a job flying offshore in the Gulf of Mexico with about 750 hours of helicopter experience. A chief pilot might then look at your IFR twin fixed wing time and put you straight in an IFR twin helicopter as a co-pilot.
You should be able to parlay a year or two of experience in the Gulf of Mexico into a job in Europe provided you can afford to convert your FAA ticket to a JAA one. Your age doesn't matter that much, really. More important for your plan, I think, is getting employment authorization in the country (countries) where you want to get on.
Honestly though why on earth would you want to switch to helicopters? Flying an IFR twin helicopter is pretty much the same as flying an IFR twin airplane (save the take-off and landing) but pays a lot less.