I have a super-strat project bubbling under presently, too, and I have decided to go for a humbucker sized P90 at the bridge, a stacked humbucker/rail in the middle and a slightly hotter-than-usual single coil strat neck pickup for a myriad of sounds on 1 platform. It may well turn out to be pants, but I figure it's worth a go, just for the lols!
Converting from a Kahler Flyer to a hard tail is going to be the hard part....