This is an old post. You could probably visit the USA depending on the country you are coming from with a passport for recreational reasons. Attend a crash cource many are guarenteed if you have experience. Your EASA lisence etc. will grant you permission to test. This all can be pre-arranged through the school.
If you do not meet the minimum experience or equivency, you could apply for a student visa and take a full cource. I did mine 8 hrs a day m-f straight for 19 months. If you are fluent in english there will be no restrictions.
On the topic of return to service, never worked ga, I believe you could do an 100hr but an additional IA endorsement is required for an annual. You are only supposed to sign for unsupervised work you have perfomed in the past (B.S.) but you COULD return any large aircraft to service under their operating certificate or the certificate of an MRO in the field or after heavy mx.