Since there are nationalities, we could create national teams and play an actual world cup. In the group stages each country will play one game against each other counrty in that group.
This would mean 80 countries can play and topcountries like Belgium and Romania don't have to play the first two rounds. Counties like Netherlands, Itlay, UK, Lithuania, Bulgaria and Portugal will be free in round one. This way no countrie will have a schedule that's too busy. Off course the next year other countries will be seeded.First round: 12 times 6 teams, top 2 progress.
72 teams
Second round: 5 times 6 teams, top 2 progress.
24 teams from round one + 6 teams.
Third round: 2 times 6 teams, top 2 progress.
10 teams + 2 teams.
SF
F
If more countries wish to take part, we could use the same system in a B-ranking where the top 10 or so play in the big league the next season.
I don't know if it's possible to create it (technicwise), but i'm certain many managers want to see something like this.