Thank you for the great explanation. It's importent to know how the relegation/promtion of First Division-> A-Championship is functioned.
For right understand: If a non-reserve-team like Mervue United win the A-Championship, it would be directly promoted to First Division and don't must going to a play-off match?
All in all I think it's a well regulation if a team finish under the top 4 in AC it's possible to going to a play-off match to the last team of FD. But I hope it will be in future less reserve sides in the A Championship and more "real" football clubs.