Anyway I think the minimal restrictio "prevent second team to purchase players from the nationality of the main team" should be applied. It's not a big one, it's not very different that a player from the utopian team can't be purchased by the main team and vice-versa.
So the goal of that suggestion is to help to create farms ? Even if they are farms with restrictions.The goal is to give a new experience to hardcore users. Some of them could be interested to try to win in another country under restrictions. Some other ones could be interested to create a farm to train players from a micronation to help it because they are already invested in their community (if the definition of a farm is a team that exists to train players for a NT/U21 team).
So the goal of that suggestion is to help to create farms ? Even if they are farms with restrictions.