Subsetting stores its license information in a file as opposed to the Repository like TDM. This location is the following: C:\ProgramData\CA\TDM
The file stored there is lic.dat.
Therefore, it is a simple matter of copying the working lic.dat to the same location on all the new VMs. Please note the Subset profiles are located in the %AppData%\Roaming\Grid-Tools\profiles.xml file. For future users, have this be one of the files they must copy from a share drive to the AppData for them. This will further reduce startup and ramp up times.