Just make sure you factor in all the costs before jumping to the N reg. The costs of maintaining the Trust can rack up: essentially, a non-US citizen cannot own a helicopter registered in the USA,so it has to be owned by a Trust registered in Delaware and companies set up to do this, charge you for the privilege. Get a quote from someone like Heritage.
I would be surprised if it made sense to transfer an a/c from EASA reg to the N and then run it. If you are thinking of importing from the USA, it might be different.