MDT 2013 or SCCM 2012 R2 WDE Drivers for WinPE Media

In short: What's the process for getting the PGP WDE drivers baked into boot media created by MDT or SCCM?

Or to look at it another way:

What is it that pgppe is doing to get the drivers added to the custom boot media?
Is it *only* copying files into specific locations or is it doing that and something else?

1. If its the former: what files are copied into the WIM and where are they placed?
2. If its the latter: same as above plus what else is it doing?

Historical:

I've seen a handful of Symantec articles on creating boot media that contains the WDE drivers for both the [seemingly obsolete] Windows AIK and the Windows ADK.

• http://www.symantec.com/docs/HOWTO64225
• http://www.symantec.com/docs/TECH149634
• http://www.symantec.com/docs/HOWTO95227
• http://www.symantec.com/docs/TECH210436
• http://www.symantec.com/docs/TECH214419
• And more

Near as I can tell, all of these processes require the operator to create brand new custom boot media and go from there.
That boot media doesn't contain any of the MDT or SCCM components, which isn't useful at all for our purposes.
Since there isn't a CAB or INF file, I can't import the WDE drivers into MDT or SCCM.

If someone can help me understand what pgppe.exe is doing to the files in C:\winpe_ARCH, then I'm happy to update the MDT/SCCM boot media manually.