Offset year cup qualification?

[Aodhan77]

In recent times in order in get my current league system to work I have had to make a fifth regional league in the 4th tier and this has sprung up an issue for my main cup. (well not really I can just avoid the league and keep the neat 64 teams)

I was wondering though, in order to give some fairness to different teams and provinces (yes there is six provinces, four of which are currently getting a regional cup winner in our FA cup every season). But I was hoping to provide the other two provinces lets call them E and F for now, the chance to get a lower league representative every other season while provinces C and D miss out for a season.

Also one of my regional leagues to miss out for another? I will also add B teams can only qualify if they are in League 3

Leage 1 = 18 teams

league 2 = 18 teams

League 3 = 20 (includes II teams)

league 4 (5 sub leagues) runner up qualifies from only four of the leagues

League 5 (6 sub leagues) winners of four province cups qualify 

 

Any pointers for a smooth interchanging system of offsets?