Heehee...ya'll make an easy fix relatively hard...
It's called industrial velcro.
JB Weld and duct tale is a good idea, but once the holster is attached, it's attached.
Depending on what kind of desk you have. the underside where your knees and feet go are the perfect place. More than likely, in that situation, you are going to duck anywho....most people go for the most available place within sight range...i.e. under their desks.
But you, my dear apple, have the worm. Right a knees felt and hands grasp, is your trusty side arm,. removable by night, holster and all, and attached by day. Even reachable without causing attention to yourself.
Shan