Hi Paul,
To go back to your original question...I am Irish, living in the US. I got my FAA PPL last year, I did it over 6 months and while working full time. So while it's not an all inclusive/intensive school, I can highly recommend
East Coast Aero Club - Bedford, MA | Norwood, MA | Nashua, NH outside Boston. Note they don't sponsor visas though.
However, with some good planning and if you had all the study done beforehand, I think it would be possible to complete the training, written & practical exams in approx. 6 weeks.
Good luck!
Humhaw