Couldn't the movie/comic adaption easily be resolved by rereleasing certain stories and arcs which had a large amount of inspiration on the films? Using Bob's favourite film for example, rerelease books like The Dark Knight Rises, The Death of Superman, and What's So Funny About Truth, Justice, & the American Way? and slap a "Inspiration for Batman v. Superman" label on it.
Obviously, this isn't a one-size fits all approach for every movie (Movies based on original stories such as Into the Spiderverse may have trouble finding a good selection of books), but it feels like a much better solution than putting a new reader into the middle of a story that's 90% characters and ideas they won't recognize.