i think midi is your only chance - especially if you are using guitar realtracks.

for example C13b9#11 contains the following notes (i think!) C - E - G - Bb - Db - F# - A

that's seven notes so it's impossible on a six string instrument. and several of the notes are on adjacent frets on the same string - can't be done. a guitarist has to choose what he plays. that's the idea of natural arrangements. as a guitarist i'd choose to play the simple major triad as a starter with maybe one or two added notes that 'sound right' in context or just part of the chord which wouldn't then be C13b9#11.

but i couldn't play the chord you want. as guitar and keyboards are the only chord playing instruments you might have more luck with keyboards (yes ukulele and banjo play chords too but they have even less strings!). i'm a 'cowboy chord' guitarist but watching jazz guitarists over the years and learning dance band chords many years ago, movement is often created by just changing fingering to include notes that move the song along. which means part chords and compromise.

i'm not surprised that guitarists like brent mason haven't recorded C13b9#11 in a RealTrack. they couldn't. I'd be surprised if Oliver Gannon as a jazz soloist has either.

is it absolutely essential that you get all seven notes or is a selection of notes that sound right good enough? so a chord synonym might be available. for example on a guitar, seventh flat nines can be played if you omit the root note and play a diminished chord based on the root of any of the four remaining notes. diminished is an easy chord shape and repeats in several places on the fretboard so a guitarist would choose a four note chord that was an easy transition from the chord before and to the chord following. and would a piano player really play the seven notes in C13b9#11 together as a chord hit? maybe a keyboard player can comment on that - or would they play a combination of notes that works harmonically to move the song along?