Let's think about this simply.
To get a humbucker from series to parallel you need a switch with two poles.
To get 2 humbuckers from series to parallel you need four poles.
To get bridge, bridge and middle, middle, neck and middle, neck, you already need two poles, so you'll need a 6 pole 5way to get this, and those don't exist. Eyb used to make a double-stack switch with eight (!) poles but I cannot find them anymore, so I think they're discontinued. 
Maybe a wiring wizard here can design this wiring where you only need 2 poles but I do not know how.