This would make U21 and NT teams "pay to win" things. Do you really want to see this?
I don't think that that will shift balance of power too much, strongest countries will stay strong but it could put managers and tactics in first plan, even more when every NT team could have at least 5 really good players to play in starting lineup.
It all could give some weaker NT teams a chance to beat those high ranking teams with certain tactics approach, at the moment for most teams this is impossible.
Evolucija Ide U Pogrešnom Smjeru...