One of those off -the-wall. ideas...
The possibility of constructing free reed instrument that allows the air to rush over the reeds, and play its own melodies, [no help by human fingers at all] into the ether, as it were! In the same way as the mystical 'Aeolian harp'..
It must be possible, and good use of old concertina parts that may otherwise be scrapped? Perhaps it would need, to a degree, still to have an encased design to contain a reservoir of air? Have a think about it- or have a go at one [or has one already been made]?