I would read "Re-planning" to also cover re-release or redispatch, so you cannot use this procedure to get around the landing runway requirements, however if you have an inflight emergency, you can dump the aircraft on a non-factored runway length.
It was interesting to note that following the Swissair MD11, aircraft manufacturers started providing non-factored landing distances in their QRH's (FAA). that would lead me to believe that they dont want to take the legal responsibility of giving you a landing distance requirement greater than certification requirements.