A simpler POD is in the formation of the Premier League era local leagues tend to wither away apart from a few teams and need to rival the bigger leagues in Europe to survive.
As far as promotion and relegation, what you could do is bring the replacements from the same country. Or have a bit of flex in how big the national leagues are, so that they could flex from (say) sixteen to eighteen if they get a team relegated from the Regional Super League.
As far as promotion and relegation, what you could do is bring the replacements from the same country. Or have a bit of flex in how big the national leagues are, so that they could flex from (say) sixteen to eighteen if they get a team relegated from the Regional Super League.