A little update. I got the super switch and everything worked as expected, except the super swtich doesn't fit in the cavity:smack:
If I force the pickguard in place it'll sqeeze something on the switch and the output from the neck pickup drops.
So instead of digging out material of the body I will either go with a 3 way switch OR I found a diagram describing the functionality of the Ibanez type switches.
Can I roughly follow the diagram using Seymour Duncan pu's? (swapping the wire colors of course)