Johnny all this sounds like a great idea.....but....there is just one problem. Just who would put the money up front for development and how long would it take to get a return on investment. Firstly there is not enough demand for that type of diatonic accordion and there is a key word that you included in your comment. Cheaper!! Everyone wants wants high quality and convience for cheap. There are cajun groupes around the country who don't play in certain places because the owner of the establishment wants someone to play for cheap. So you see it is a two sided sword. When everyone wants cheap the market sorts things out. Hence, no reedless diatonic accordions.
Maz you can fix this yourself. Try this. First remove the stop knob and rod from the small block inside the accordion. Now use an exacto knife or someting similar to remove most of the old glue from the slide and block. Then using that same knife rough up the slide and block surfaces which were glued making small scratches on each so that the glue will have something to hold on to besides slick surfaces. After this glue the block back in the same place it was using Elmers carpenters glue or similar glue. You may have to apply some weight to hold it in place. Let dry and screw the knob and rod back in place. Voila!! cest tout.
I would suggest the same as John, only thing that might be difficult is if there was glue applied to the rod before it was threaded into the block or the knob. The one thing that I am doing with the stops that I am installing, is in addition to gluing the block, I try to put 3 nails into it also so that I hopefully won't run into this problem.
Interesting thread...my suggestion is never pick
up the accordion with the stops....if you 'pull' it
out of the case by the stops, or do a jerk with your wrist,
something bad could happen. I always use two hands
to remove it from the case or the left hand strap to carry mine....