This just showed up FS. No affiliation with or knowledge of the seller, but it does sound pretty fat in the video linked.
https://www.acousticguitarforum.com/...d.php?t=620460
Smaller than your goal, but short scale!
Maybe a custom cutaway 12 fret???
I also suggest talking to John Kinnaird, as he is generally up for a challenge.
Best on your worthy quest!
Paul