I have this great moneymaking idea for nations:
Talk to the people at the registry in Isle Of Man for instance, make them accept all aircrafts as registrants regardless of where they live. Let the aircrafts on the registry be serviced to both EASA and FAA and or any ICAO compliant standard. Let them be flown by anyone with an ICAO standard pilots license. Charge $1000 a year for it. Make billions.