I stumbled on a pre-Hohner German accordion made by Koch, probably early 1920s. 3-row box, F, B-flat, E-flat, two reeds per note. I didn't think about repurposing the reeds, but this thread has me thinking. Link #1 is an overview of the instrument by a local repair tech who restored it, Link #2 is his shop, Link #3 is Scott's YouTube page. He teaches engineering, and has an amazing setup for repairs.