Wire the switch like the auto split diagram, with two exceptions:
1) Take the black wire from the humbucker to the common lug of one pole, as shown in the "bridge-on" diagram, and wire the push/pull to the switch and volume pot as illustrated in the "bridge-on" diagram.
2) At the same lug where the red and white attach to the switch, attach a third wire. Connect the other end of this wire to the common lug on the open pole (this is the "center left" lug if you're following the diagram). On the "bottom left" (left side, lug closest to the volume pot) solder a wire and attach the other end to ground.
Let me know if that doesn't make sense.