Re: Three way switching option
Going from memory and without drawing a lot of scribble lines on paper (I can't help it, I'm an engineer) I believe it's tough to get a series/parallel switch to work only in the middle position of a typical Gibson-style 3-way toggle. I think if you want a series combo on that type to guitar, you settle for a switch that adds the neck in series to the usual bridge position.
Series/parallel is easier to do with a Fender-style blade switch. Bridge/parallel/neck/series is a common mod on Teles with a four-way switch. Check the support page, I'm sure there will be 4-way Tele diagram there.
Does the Page wiring include a pickups-in-series mode? You might find some insight there, but tied amidst all the other doodads.