+1. Seems like, at worst, any sort of manufacturing inflexibility is solved the same way they usually deal with this stuff: A ribbon cable. Then you just have

+1. Seems like, at worst, any sort of manufacturing inflexibility is solved the same way they usually deal with this stuff: A ribbon cable. Then you just have to worry about the physical security of the machine which is its own independent issue regardless. Personally, I assumed they did it this way since it seems obvious (that's what I do in my own electronics projects) and much simpler than using a microcontroller to do it. I forwarded this idea to concerned friends. Looks like I'm eating my own words.