Underneath this a Championship of 24 teams or something like North and South Championship?
I'd have a Premiership of 18 clubs and the same number of clubs in the Championship, making a total of 36 league clubs. This is a reduction from 42 clubs currently.
A 24 team Championship would mean a league season of 46 games per club. If you have a harsh winter, and then factor in Scottish Cup and League Cup ties, it would make for too congested a calendar. January and February could be thick snow and then you'd be squeezing in three games a week in March/April to catch up.
I know the EFL sides down south manage it, but that's a wealthier league system with better grounds (undersoil heating) and a bigger budget for travel.
So four teams down from the Prem, four teams up from the Championship. And another four teams down from the Championship into the Highland/Lowland leagues.
At any given time in the Championship you'd have 8 out of 18 clubs occupying either a promotion or relegation spot. And the 10 clubs in the middle would still be in the mix in either direction. Imagine you're in 9th or 10th place. Attaining 4th spot isn't a pipe dream, nor are you safe from dropping down to 15th place and being relegated.
In every round of fixtures it is almost certain that every club would have something tangible to play for.
As for the Premiership, Old Firm and Edinburgh derbies would take on more significance if there were only two of them in the league each season.
We'd go to Pittodrie once per season, not two or three times. The Mhanks would go to Tynecastle once per season. It would be more of an event.
And if you draw a club from the same division as you in the cup, then it's less samey if you're only meeting twice in the league each season.
And, UEFA coefficient permitting, Scotland would have four European spots up for grabs. Two CL, one Europa and one Conference. So looking at mid table clubs, if they can put together a run and finish 4th then hey presto they're in the Conference League qualifiers. Go on a bad run however and all of a sudden you could be facing Championship football the following season.