Powershell and Externalization

I use the StoragePoint PowerShell API for a lot of management tasks including creating new endpoints and profiles and stopping and starting services. I have a large number of storage profiles and would like to be able to use PowerShell to enable or disable Externalization for all of the profiles. We will be moving the endpoints to new physical storage and manually clicking the drop down for 300+ profiles is not going to be fun! I can't find anything in the PowerShell and API Reference Guide for this. Has anyone done this or have any idea how it might be accomplished?