Exactly, nice and simple.
After one season of that I would go off of the league standings and have a 16 team premiership, 2 rounds of fixtures and then top 8 bottom 8 split (37 games), 2 down and 1 playoff, and a 14 team championship, 3 rounds of fixtures - 39 games, 2 up and one playoff, 1 down and 1 playoff. Therefore more prize money for some smaller professional clubs, as 42 I think is to many. Below the championship could be a semi professional 'national league' and then the lowland and highland leagues feeding into that fluently. Then having a South, East, West division 1 feeding into the lowland league, and the North Caledonian highland league (I think its called) feeding into the highland league. You could then have different divisions for east and west.