I will be experimenting with joining 3 chord reeds together, just to see what effect it has on sound. Will probably be another misguided experiment, but I have fun with misguided experiments.
You all know about a reed-manufactory in the Czech Republic named Harmonikas. Link#2.
The make Helicon Bass Reeds by request.
They also make reedplates for Bayan, Bandoneon, .....
Maybe it's also possible to ask them to make reeds that looks/sounds a lot like the Old Germans.
Just a thought.