[Blau Vogel]

A rough idea based on a softball league I used to play in. Each night there were four leagues playing. A, B, C, D At season's end, the top two teams from B would be moved up to A for the following season, with the bottom two in A were dropped to B. Same for B to C and C to D.

Since there were only eight teams in each league two teams up/down worked well. Maybe with more teams in football, the final four could be moved up.

To get it started, you play out this season. Based on the finals, you start the next year with the up/down changes.

Like I said, this is rough, but could probably be tweaked enough to work.