Haven't studied the piece yet, but here is a cadenza for you:
https://www.free-scores.com/download-sheet-music.php?pdf=23704Good old Rachmaninoff also wrote one of his own;
https://erato.uvt.nl/files/imglnks/usimg/2/20/IMSLP30621-PMLP69100-hungarian_rhapsody_2_cadenza.pdf, and I do know Alfred Cortot did an edition of the Liszt Rhapsodies, he might have included one or more cadenzas, and Marc André Hamelin has been playing a very jazzy cadenza he did, I couldn't find it through Google but maybe one of his recordings might inspire you to write your own, based on his.
Nah, really, may I suggest you try writing one of your own as wel? Just write down the chord progression during some of the melody parts and include them when you build a nice series of arpeggios and scales, add in some big octaved versions of some of Liszt's melodic elements in between, perhaps with a few chromatic bits in between because after all, it's Liszt and in ornamental parts of his works he does like dissonants too, and loves chromatic keys throughout his entire oeuvre... imagine the morale boost after writing an impressively sounding, but tailor-made for your own skills, addition to this great work would be!