There’s an old expression in the film industry that says “kill your darlings.” If you’ve never heard it before, it means that even the ideas that you love the most should get cut if cutting them benefits the overall story. So I personally really like the rhyming inscription, but if the film is going to flow better without it, then removing it is unquestionably the way to go.
(I personally think it would still be better to change Jannah’s line than to change our entire mythos surrounding the dagger, but it depends whether we can manage it successfully or not.)