Thank you Andre. I appreciate the help and will investigate Music Playlist Manager. I can't do a universal add back with duplicate block because i dont want my full library occupying each playlist. If there are any database experts here who could somehow use my library database and playlists and create a playlist of songs that are not in any other playlist I would happily PayPal a $50 remuneration.
Obviously I will be obsessively backing up playlists going forward.