Okay, I'll think on it some more. The problem is plugboards/templates only act on one book at a time, while I want to look at the book in the context of [a subset of] the entire library.
Which is why I was thinking I could twist an "orphan series" check to serve my purposes as well.
By the way - the Duplicate Series Check had an added bonus for me -- I found a bunch of duplicate books that slipped by Find Duplicates
What I really should do is stop playing with all your nifty tools and get back to my reading list
