Conversion ? Today with JAA there is really no way of conversion. Look at doing it all over again. Only "easy" way out is if you have many multi pilot hours and ATPL, but that is not easy either.
Ah, wait, Norway enter JAA june 1st THIS YEAR. Maybe if you are real quick you could get a conversion before that. But don't wait until tomorrow then.
I advise you to get in contact with the Norwegian CAA.
TD