Those are great ideas! Especially the regional Super-Leagues (South-America, Balkans, Scandinavia, Eastern Europe, Central-Europe, Africa, Western-Asia, Caribbean...) to make those regions competitive along the Big 5.
Sometimes the game gets boring when the same Nations always win the biggest trophies in the World.
I made a Database with a competition where each team represents a city, based on Luxembourg. I separated all clubs (cities) by regions (16) with two major world tournaments and an end of Season Super-Cup between the two winners.
Every League (Region) has the same power.
So, for example you can have a Stockholm vs Tokyo Grand Final at the end of the Year. Or maybe a Munich vs Brasilia, or Cairo vs Madrid, or Seul vs Milan. You get the idea.
That's the only solution for a New and Complete World I could come up with.
Every other options I though of required to change too many active Nations to move clubs from and the game felt broken.
I'm enjoying the game like never before, but I know is not for everyone.