Someflyer, you have my sympathies. You won't find anything that states that part NCC includes 3rd country licence restrictions, and that's because there isn't anything. Part NCC has nothing to do with licences although certain individuals have jumped on the bandwagon to include it which they most definitely should not.
It's good you have called the FAA, good to get them involved in this rubbish, maybe you could knock it higher up there in their legal department ?
There are currently two completely different statements from Brussels and the UK CAA. According to a working group of third country licenced pilots the team in Brussels responsible for the derogation meant for it to be EU wide and not airspace or country restrictive. Also they have stated that all pilots paid or unpaid in private operations are allowed to fly unrestricted until at least 8th April 2017.
This is in writing and many of the third country licenced pilots in this situation have had visibility of the emails from the MEP's responsible for the regulation assuring them legally that they are fine to fly. Should you wish a copy of this them pm your email address as this information can hardly be argued with in any court of law. Print it out, and take it with you on your flights. The MEP has given permission for this information to be shared and for them to be contacted if necessary for verbal confirmation.