I had this same issue. Here's what I did.
Create a new filter, For filters included in this filter put in "All Windows Computers with Inventory Solution Installed" and then under filters excluded in this filter put "Computers with Inventory Data"
This should give you all the windows computers with the plug installed and don't have inventory data.
Now go under tasks and create a new inventory task, and apply it to run daily(or hourly if you like) on the filter you created above.