Did you ever get this figured out? I'm the only ePO admin and I want to allow our helpdesk to remove out needing me or much else (a passcode, for example). So I'm trying to accomplish the same thing.
I first had to extract the contents of the agent package DLPAgentInstaller.x86.exe from command line c:\DLPAgentInstaller.x86.exe /extract C:\temp
Then I copied the files to a share that everyone had read access.
Then used msiexec /x \\Server\Share\DLPAgentInstaller.msi /qn /promptrestart
qn = quiet no UI
promptrestart did not prompt to restart, but I put it in just incase.