Mainly pulled this nonsense from the MLS, which is even more messed up as they have uneven games, but here we go...
In a 12 team league you play home and away for a regular season of 22 games. Maybe the winner gets the top CL spot and some sort of fans shield like they do in the MLS.
The teams that finish in the top 8 go into a mini-league, starting at 0 points, playing an additional 14 games for the "SPFL Cup" and additional European spots. The bottom 4 would be joined by the top 4 from the Championship in a similar format of 14 additional games to say in the Premiership.
Like I said previously, the whole thing is a shambles.
If we are forced to play each other 4 times dot to TV we would be better just having a 10 team league, but nobody is going to vote themselves out of the league.