Install SMA on servers with just inventory plugin

Hi, we want to start installing SMA on our servers, but with only the inventory plugin. This means I need to modify the target of each plugin install policy to exclude the built in filter "Windows Servers" right? (I've actually cloned "Windows Servers" and added a new filter for Windows Server 2012). I started doing this for Arellia, Recovery Agent, but the Deployment Plugin Install policies won't let me edit the target, so I'll need to add a new target using "Computers without Deployment Plugin installed".
Is there an easier way to do this? It must be quite common.
Thanks
Gareth