If they can turn a leg nerve into an auditory vestibular nerve let me know!
I can't see how leg nerves can be turned into a facial, trigeminal, or hearing nerves.
Who knows though- Science can change..
they'd really have to do some frankenstein cutting to get your facial nerve to branch off into the upper and lower jaw?
Or perhaps most likely the technique would just replace-graft the part of the nerve that a tumor has taken to "revitalize" the original nerve?
I myself do not know where the vestibular cochlear nerve goes to in the brain. I only know where it started right --behind the cochlea--where the AN starts too....