Unfortunately you can't do a UK AFIC in the USA. The only way to be able to work here is to find an employer willing to sponsor you (very unlikely). To do this the employer has to show there are no US citizens who can do the job.
Other than that, if you have no more than a PPL you can fork out $25,000 and get your school to issue a J1 visa which allows you to get work experience afterwards for about a year. A friend did this and then married a USA citizen so he could stay.
If you do come the exams are easy - the FAA in its wisdom publishes all the Q's & A's for you to study from!