The Suzuki Andes 25 F can also be used to play “portative organ” tunes
Here’s a video with a beautiful portative organ
A bellows makes the instrument less dynamic than a mouth piece, but bellowing can help if breathing is too hard.
Melodicas or Suzuki Andes could also be made with bellows, but we would call them harmoniflutes or … accordions/concertinas.
The charm of melodicas and mouth harps is in their small volume, and the reeds being so close to the mouth.