No way I'm aware of. I know you can't create a View Filter based upon the "Host" Parameter. You might get a reviewable Warning, but I don't have Revit in front of me to test.
I think your best bet here is to write an API tool that will identify the Elements that have no host.
Cheers,
Kyle B
Sustainable Design Product Manager
Kyle Bernhardt
Director
Building Design Strategy
Autodesk, Inc.