After scouring the Internet this weekend, and waiting on hold with AT&T my fears were confirmed. There is simply no way to remove the “Emergency Call” option when the phone is locked. However I did find another option which has been working just as good if not better. By holding down the mute key the phone will go into standby mode disabling all of the keys except the mute button. Unfortunately I cannot figure out how to map the side keys to the standby function, but it is a step in the right direction.