My proposal for European Rugby:
Create 3 regions - West, Central and East, 7 in each.
With 4 Irish, 3 Welsh, 1 Scottish, 1 Italian, 6 French and 6 English teams - 21 teams. Regional, so you wouldn’t have 3 from the West country and 3 from the Midlands, they’d be spread out.
No more than 7 non-resident players in each squad.
Feeder regions. Return the remaining teams to respective domestic competitions. Reinvigorate local rugby in-line with the NPC/Currie cup models.
Have Champion of Champions Cup. Winner of European competition vs winner of Super Rugby.
Controversial and unpopular I’m sure this will be with some. I think it’ll focus energy and reinvigorate domestic games.