This method does not work. I tried for 3 hours and it doesn't matter if you use undesignate or not all station's get the exact same coordinates no matter how you do it with the TGP. Even trying a single station using TOO 1 and TOO 2 both JDAM's get the exact same coordinates.
EDIT: Actually this does seem to work on BETA but not on stable right now. So certainly an update there which is good I guess.