I am not a concertina maker, but I've been reading about reed construction (blue steel vs brass vs aluminum, vs new steel, etc). So when I came across this article about researchers at the University of Maryland who found a way to change the cellulose fibers of the wood, I thought perhaps the technology could be used to make concertina reeds. Crazy thought?
https://umdrightnow.umd.edu/news/umd-researchers-create-super-wood-stronger-most-metals