The Hub

Breedlove Roots D/SRH (basically an HD28V) on the bench with a non functional trussrod. Wrench will engage, but the nut just spins and no change in relief in either direction. Pretty sure the nut is stripped at the rod end, but due to the neck block design, there's no way to access it without pulling the neck. Anybody ever replace a trussrod in one of these? The neck is a bolt on, and the fingerboard extension is glued down, so only moderate hassle to pull the neck (pretty sure they used epoxy for the extension), but I worry that the rod isn't replaceable without pulling the fingerboard.

Fortunately, there isn't serious backbow, and string tension pulls the neck pretty much dead straight with no relief. I can go up to 13s, and cut a taller saddle for it and should be playable (even as is the guitar sounds *fantastic* which is why we're considering surgery), but any advice/intel on the trussrod construction would be greatly welcomed. Thanks