I’ve given this some thought. What they should do is have a massive 5 aside tournament.
Split the 20 teams in to 4 groups of 5. The groups are seeded by the Premier League table as it is at the moment. So the top 5 are in Pot A on so on. Each time plays everyone in the group once, with 12 minutes games.
If you win your group you get a Champions League spot and progress to the winners playoffs. The winner of the playoffs are the League Champions.
The 4 teams that come bottom of their groups also go in to a relegation playoff. The team team that wins the loser’s playoff stays up and the other 3 are relegated.