Would it not work as stages? So Serie 4 would be stage 0, with each of the nine groups top four qualifying for stage 1 (Serie 4.1), and the rest of the teams qualifying for stage 2 (Serie 4.2)? Set stage 1 to have promotion to Serie 3, for the top four of each group. Stage 0 runs in the autumn, stages 1 and 2 run concurrently in the spring.
Same principle for the others. Serie 3 is a separate competition, stage 0. Serie 3 kval is stage 1 and Serie 2 kval is stage 2 Stage 0 runs in the autumn, stages 1 and 2 run concurrently in the spring. Stage 1 has relegation to Serie 4 for the bottom 3 of each group and stage 2 has promotion to Serie 2 for the top six of each group.