revit provides you with no way to search for or schedule "not associated" families. if a family is "orphaned", you can use the "Reconcile Hosting" button to locate and rehost these families, but not the "not associated" families.
Thanks for taking the time to submit your idea. Unfortunately, this idea did not get the support of the community over the last 6 months and as such we will not be pursuing it at this time. Please feel free to rework (titles and clear descriptions are really important) and resubmit this one down the road.