Cheers 74,
If its netjets your friend is interested in then it would be better to get in touch with the portuguese authorities or even better get in touch directly with netjets europe. All netjets aircraft in europe are registered in portugal. If they were to offer a validation to your friend he would still be able to live in Finland and fly netjets aircraft all around europe! Assuming of course he has the right to live and work in the EU. Good luck.