I understand that the investment is to big for such machines.
But I saw machines (hobby) for lower prices, but that ones can't do all the things for building an accordion. But when I saw the movies , I found it very impressive what they could do with a CNC-machine.
Next question is maybe 3D-printing

I personally look at it this way. I build accordions because I love to. I love woodworking and the feel and smell of the wood. I am also a woodcarver. A CNC machine would take all the fun our of building an accordion. I also like good food and like to eat. So a CNC machine would be kinda like rushing through a fine meal.

I wouldn't think a CNC machine would be of much good except for drilling the faceplate holes, bass box holes, and possibly the button pivot slots. Seems the rest of it is hand or router work.