Can anyone help me work out how to lock a shout that has been unlocked? Not remove it, lock it.

• I can't find any relevant console commands.
  
• http://www.gamesas.com/topic/1406655-script-opposite-of-unlockword/
  
• I've tried a papyrus script that removes the shout first then adds it again but it remains unlocked.

I'm at the stage where i would even consider hacking the save file if anyone knows how and could provide instructions.


DETAILS:
This is for a mod im working on that will be packaged with a save file. (Im not just being crazy pedantic about a misspent dragon soul.)