Hi,
As of now it's not possible with the help of SEPM console.
Only uninstall is not possible with the help of Competitive uninstaller. You will have to do uninstall (old package) and reinstall (new pacakge) using competitive uninstaller. This tool is not supported by Symantec.
I would suggest to run uninstall script using GPO.
"Methods for uninstalling Symantec Endpoint Protection"
http://www.symantec.com/business/support/index?page=content&id=TECH184988