Ok, if I understand correctly,
to ensure that both the coil split and the auto split always work, the green+white of the humbucker go to one of the central lugs. From the same lug I connect a wire to the autosplit position on the 5-way. If I go the other way around, humbucker to switch to p/p lug, it will only split when in second position, right?
On the same pole, the upper lug goes to ground.
Now, can I use the other pole to always use the split coil with any switch combination, which than actually be only noticed when the neck is switched on (position 4 and 5).

If I do it like above, I can circumvent the switch, but it won't be split, right?
So, if I first connect the hot from the humbucker to the second pole's middle lug, and then go to the switch, this should work, no?

When pot is pushed, nothing happens, signal is directed to switch, with an autosplit when in second position. When pulled, bridge gets split, and signal is sent to the 'in' lug of the pot with the additional selected pickup from the 5-way switch.