E.G.,
I'm delighted to hear of your ambition. As was mentioned earlier, your licence is a licence-for-life, so it's just a matter of passing the medical and then getting an FAA piggy-back license.
As far as going solo is concerned, given your experience, I suspect that an hour of upper-air work and an hour in the circuit would be enough to reach solo standard. It's like riding a bike or skiing - it comes back quickly.
Getting used to the rapid-fire ATC may take a while, but generally flying is much more relaxed in the US than in the U.K.
Good luck and keep us posted.