Not a fun project, but as others have said it is fixable. I have removed truss rods from necks I have messed up building to use in other projects. I used an iron and an icing spatula. The fingerboard wasn't usable afterwards but maybe someone with more skill could save it. That was with tight bond used also. Hide glue would be even easier.
As said above I wouldn't remove anymore wood.
As said above I wouldn't remove anymore wood.