DOUBT VERY seriously if they would be familiar with the intricacies of the U.S. Internal Revenue Service laws. It would probably be to your advantage to have a U.S. accounting firm prepare your returns if you are not able to do so personally. Just a thought.
I work for an CPA firm here in the states. We prepare many returns for people living/working in other countries. Many of our clients fax and overnight info to us. Not a problem. Everything can almost always be do online as far as filing.