I would love the GPXes of this as well - I'd love to do these sections sooner than later while I am still in Phoenix.
A few of us have begun to put together a central AZ route, sort of a compliment to the AZT. It's a route from Flagstaff to Tucson. For the Flag to PHX portion we were going to use the beginning section of the Coconino 250, peel off that going up Mingus where the singletrack HAB is, then make your way to the northern terminus of the Black Canyon Trail via forest road & follow it down to the end. From there it depends on what part of PHX you want to end up in. Our route follows the Maricopa Trail for a bit into the Sonoran Mtn. Preserve, now you're in N.PHX. I can send you a couple of GPX files if you want them, keep in mind they are still preliminary, but should do the trick.