I would also check with insurers as to their stance; they don't need much encouragement to duck out of a claim!
AP
That would be an interesting one as EASA licenses are not legal or valid on the FAA aircraft being flown and if the pilot holds all the required legal licenses to fly that aircraft as well as the required medicals, type ratings etc the aircraft is legal
The EASA licenses are as useless as toilet paper and have no legal standing on an FAA aircraft so I would imagine not holding the EASA licenses would be a technical infringement rather than an aircraft illegality infringement but interesting point