I know you're looking for a way to modify your existing holster, but may I recommended the
Desantis SuperFly? It's essentially the Nemesis with a tacky surface. It also comes with a removable outer flap which can help breakup the outline of the gun and make it more secure in larger pockets. Use the SuperFly for your baggier/bigger pockets and the Nemesis for the others.
HTH,
CJ