I have long thought that the whole issue is only to protect the training organisations in Europe. The amount of non European registration movements in Europe, under all types of scheduled, non scheduled, private and corporate ops is totaly accepted, notwithstanding, operaters who are proved to be unacceptable are banned from EU airspace. So all manner of ICAO (and more) licences are flying all manner of aircraft in Europe. ICAO training is not acceptable for an EU licence, why? Who would pay the high cost of EU aviation and suffer the EU weather given the choice to train elsewhere, only a fool. Answer, make EU training appear different, convince everyone it is superior, make it hugely more expensive and do not accept ex EU training. Result, anyone who can will use a more user friendly registration.