Yowza, broken indeed. Probably fixable though, it sounds like you have the plan. If the truss rod was not bent, you could probably get away with just working glue in and clamping. The way it is, i think your plan sounds good, fingerboard off, remove the truss rod, glue the break, truss rod back in, maybe rout and inlay carbon fiber stiffening rods, fingerboard on, touchup, probably refret, setup, and maybe some extra steps thrown in there for complications that may arise.
One minor benefit of cracks going that way, as opposed to the more common type of headstock crack running diagonally in the other direction, is that the string tension will be constantly pulling the break closed, as opposed to constantly pulling it open. And you also have a massive amount of gluing surface area. How easy it goes mostly depends on how clean the break is, and whether there are lots of little wooden "spears" sticking up that stop the crack from closing cleanly. If the whole thing just sort of hinges shut cleanly, you are in luck.
The finish will probably look pretty crappy without major touchup work, which this student may not want to spring for. In cases like that it may be easier to just refinish the whole neck, rather than trying to go in there like an artist, especially since it is black. Sometimes the scars can serve as a reminder to savage guitar owners that they should take better care of their stuff.
The other option is to make a new neck, using the old fretboard and headstock inlays. Kind of fun to do, but more work.
_________________ Jordan Aceto Ithaca, NY
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