For those who may have cast an inquisitive glance at position 2 (two split humbuckers) of the following Ibanez Humbucker-Humbucker switching scheme, I can report that it is indeed good.
The Ibanez I am working on has the popular Air Norton neck and Tone Zone bridge. No air, and no tone either. The Tone Zone is standard, but the Air Norton is reverse magnetic polarity, so hum-cancelling is indeed present.
Take note if you plan to swop pickups in one of these.