Blocking/Disabling App-V Package on Certain Workstations

I have an App-V package that I want to disable on a small number of computers. The reason is we are doing a comparison test between App-V and traditional installs. So the package still needs to be available on all other workstations, to all users, and other App-V packages still need to work on these pilot machines.

Therefore we need to disable a single app/package per workstation.

My question is this: would the following command achieve this?

SFTMIME DELETE APP:appname

Or would the package re-appear when a user logs on? If this is not the way to do it, is there another way? App-V version is 4.5.

UPDATE: I discovered that the above does not work. Instead you need to delete the package rather than the app, and do it using the package GUID rather than the name.

I have also discovered that the package does in fact reappear when the user next logs on. So, I have put the SFTMIME command in a .bat script and made it run as a logon script via Group Policy. It just remains to be seen whether this runs before or after the App-V client updates from the server, and whether it is consistent.