Thanks for this.
So do you place the .exe of the USB driver/software directly in %windir%\setup\scripts folder? "Optiplex_9010-USB3" <-- or is that a subfolder containing .inf files?
Any way you could possibly send me a copy of your files so I could use them as an example? I get BSODs on my hardware and would like to use the SetupComplete method to finish things up.