No trees on the GT ledge should be "approved" for rappelling. The resulting soil compaction will kill them. This is why many rappel trees on the GT ledge have already died. If you don't want to contribute to killing the trees rap from bolted stations, or climb to the top and walk off.
Luncander, RG is something of a historical treasure at the gunks. As both a junior faculty member and a comparatively junior climber, perhaps you will consider the wisdom of just being quiet and listening.