Check out this script (script from Nabscripts.com and modified for Video Copilot).
I don't know where you can find the script by itself... here it is boundeled with a project file:http://www.videocopilotstore.net/208b91bb69c7d5c1f791128e7cdc7b82/videotutorials/projects/86.zip
unzip the file to extract: MasksToLayers.jsx (from "Script" folder)
This script will duplicate your layer and will reposition the anchor point at the center of the mask.
In case you have several masks on that layer, the script will duplicate the layer for each mask you have on it (each duplicate will contain only one mask) and it will reposition the anchor point of each duplicate at the center of its mask.
I hope this helps.