Here's what I would do -- run MyUninstaller by NirSoft (it's free). There is no install for the software-- just an EXE. Run it on a workstation with VNC installed. It will show you the Uninstall string for each program installed. Copy the uninstall string for VNC (note - you will have to do this for each version of VNC installed). Create a Software Package in DC using the Uninstallation String, and then deploy.
I have used this method for uninstalling lots of software, although never VNC. I may soon, however, because I am in the process of upgrading my Win7 computers to Win10 and the upgrade seems to hose my VNC installation. I haven't had time yet to troubleshoot the VNC issue, but I may just have to uninstall/reinstall.
That brings up a question -- is there a stand-alone viewer that works with Desktop Central? The DC remote software has gotten better over the years -- my major complaint is that it takes longer to remote in because of the multiple steps you must take. That is why I still predominately used VNC over DC remote. If ManageEngine would release a stand-alone EXE for connecting to workstations it would make my life easier.
Jason