As I give https://technet.microsoft.com/en-us/library/hh824873.aspx a second read (have read it before) I don't see how the USMT applies here. What you seem to have is a post USMT step to perform.

In fact this should be something in your Windows Server login script to handle new user (on this PC) logins.

That is, USMT looks to be for bare metal OS installs and not what we expect to handle per user via Windows Server login scripts.

-> Didn't they cover this in your Windows Server classes?