I've had an idea for this for a long time, but I'm not nearly talented enough with the Editor to make it happen.
Yearly Club World Cup, played each August.
32 teams qualify, including:
Previous year's CWC champion [1]
Previous year's continental cup champion (UEFA Champs League, CONCACAF, Asian, CONMEBOL, Africa, Oceania) [6]
Previous year's domestic top league champion for top 25 nations (Prem League, La Liga, Bundesliga, MLS, etc etc) [25]
Then, seed them into 4 buckets. The top teams, like the champs of Prem League, La Liga, UCL, etc, would go into bucket 1. Bucket 4 would be the lowest leagues champs.
Then, you do a ladder tournament, where the teams of buckets 3 & 4 play each other, winner playing teams from bucket 2, and winners of that playing bucket 1.
With 8 teams per bucket, by the time the winners of the play-down games of buckets 2,3,4 play bucket 1, there would be 16 total teams left. That would mean a max of 4 games tourney for bucket 1 teams.