If its operating under FAA regs isn't there a very expensive Engine AD that needs to be completed?
If it retains US registration, then yes, shaft axial motion AD, due now...unless already terminated, of course.
This is why I suspect that the airplane, once it reaches its overseas destination, will revert to a non-US registration.
And, going just slightly further, I also suspect the reason the present owner only wants pilots/engineers with FAA licenses, is simply the fact that many others know the company/individual, and the suspect renumeration issues, whereas US pilots might not.