You know how on most headstock scarf joints you make the angled cut, flip the headstock piece, and glue it across the angle-cut face of the neck blank? If you glued it instead with the angle-cut face of the headstock piece against the back of the neck, would it be stable enough? Seems like it would be fine. The reason I ask is because my guitar teacher was just complaining to me about how having the joint under the fretboard can cause problems. This seems like a good way to move it elsewhere.