I like puzzles.
OK, you mentioned "I also want to have a neck on mod which, when pulled, it activates the neck at any time."
That leads me to suggest using the 3 position switch to connect the bridge and middle pickups.
That switch output gives you the bridge/middle/both options.
The neck pickup will be on the pull up switch on the front volume pot.
You need the ability to turn off the switch output to let you use the front pickup by itself. Install another pull up switch on the rear tone pot. Up is switch output off. So both knob switches pulled up would be neck pickup only.
The only thing you need is the polarity switch for the middle pickup. Maybe another little toggle switch. Either drill the hole between the rear knob and the switch in the middle. And then move the back pickup tap switch next to the knob and make the middle switch the middle pickup polarity. Or drill the hole on the other side (rear side) of the rear knob if there's more room. Probably the first thing though.
Back pickup to its series/tap switch first. That output to the 3-pos switch.
Middle pickup to its polarity switch first. That output to the 3-pos switch.
3-pos switch output to the on/off switch on the rear tone knob.
Output from rear tone knob son/off witch to the front volume knob.
Front pickup to the front knob switch. That output to the front volume knob.
Tone filter connected to volume knob as normal.
Volume knob to output jack as normal.