Disable logon during Softwaredeployment

Hi, 

seems like everyone tries to implement autologon during softwaredeployments but i wasn´t able to find a solution for what i´m trying to do. 

Here´s the scenario:

I´m deploying Windows 8.1 using - unfortunately not SCCM - Frontrange DSM. After OSD+Domainjoin, the DSM Agent starts before logon and installs a set of common applications in a predefined order with multiple reboots. To make sure that those computers will not be taken to the user before completely deployed, i want to disable logon until the last application has been installed.

This way i would make sure, that our onsite support won´t start customizing the clients for our users before they´re completely setup.

Any idea how to manage this? 

thanks and best regards, 

Andreas