"Premier League, A1, A2, B1, B2, B3, and B4. Each league has 14 players. At the end of each season, the top 4 players from A1 and A2 would feed into the Premier league, and the bottom four in Premier league would be demoted to *level* A. The same would happen for A and B. Top four in B1 and B2 would feed into A1. The top four in B3 and B4 would feed into A2. The bottom four in A1 and A2 would be demoted to *level* B."
That's 7*14 participants, 14 more than the highest number we've had, 28 more than this last season. But hopefully we can gain some players back. In any case, the B level has to be a flexible number of boards as the number of participants will vary from season to season.
So in your suggestion the premier of 14 people has 4 go down and 10 stay. That seems like a low number of demotions. Or did you mean 8 go down and only 6 stay? That seems more reasonable.
Right now the promotions/demotions are as follows:
Premier: 7 players - 4 stay, 3 demoted
A: 7 players - 3 promoted, 3 demoted, 1 stays
B1/B2: 14 players - 3 promoted, 6 demoted, 5 stay
C1/C2/C3: 21 players - 6 promoted, 9 demoted, 6 stay
D1-?: 21-35 players or so - 9 promoted, 12-26 stay
But keep in mind that with players dropping out from one season to the next affects how many are demoted and promoted.