Normal entry is now via a spell as a Second Officer. Only after about 3-4 years and upgrade to Junior First Officer you are eligible for a basing in the U.S. ( or maybe even later, not sure). Problem is that basings are granted on a seniority base and hence you very well might have to wait much longer. Mind you, the position of a Second Officer is designed for junior pilots without much experience, so you would feel highly overqualified. Since a few years now there is no expat package any more for new joiners, so have a good look at the numbers, I would be very surprised if you would find it an attractive option.
Best of luck and have fun on the boat.