Squad Registration Data

[sit8]

Hello I need help, surely someone knows how to do it. I want to change the registration rule to limit foreigners in the countries, similar to how it was before the Bosman law, so that teams do not have more than 4 foreigners and empower national teams. This way they could also have Argentina, Brazil, Croatia... better leagues and compete for continental titles.
Setting the limit of foreigners is not a problem, the problem comes when in countries like Sweden you don't have to register players at the beginning of the season and they have 10 foreigners and they rotate them in matches. My question is, how can I make them have to register the players at the beginning of the season?
Thanks for the help