Consolidating to a unified 'username' convention in PacketFence w/ Active Directory

I'm very close to having PacketFence running in my lab...very close.

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The last step is to figure out how I want users to be presented within the PacketFence UI and what credentials they will use to login.

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By convention, my users understand that their "username" is their "email address" (which is really their UPN behind-the-scenes). This alone is pretty trivial to implement.

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However, when users login by re-using their Windows credentials (which is part of the typical login flow from machine authentication to user authentication when using a deployed WPA2 WiFi GPO), the username presented to PacketFence is the pre-Windows 2000 format: Realm\Username.

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How can I catch these pre-Windows 2000 formatted usernames and re-write them so they match UPN-based usernames within PacketFence?