Number 2 is the biggest problem. But what if we gave that up?
As I've probably mentioned on this forum before (so sorry for being a broken record), there needs to be an accordion version of the "practice chanter". Practice chanters are sort of like a bagpipe without the bag--useful for beginners who want to start learning without shelling out a bunch of money for the full deal, but also for experienced players who just want something small, light, and relatively quiet to practice on. It's not the same as the real instrument, obviously, but that's not the point of it.
So basically an electronic accordion without the bellows. Sacrilege? Perhaps.
But think of the advantages... Dealing with the bellows, pressure sensor, and all that stuff is the major barrier for a manufacturer. With all that gone, any company that makes those electronic keyboards you find on Amazon for $100 or so could potentially make one of these just as cheaply. The sounds wouldn't have to be super-realistic. You'd have keys on the right side, buttons on the left, and the various switches and electronic guts in the middle. Plus a small speaker and a headphone jack. Wear it on your chest like an acoustic accordion or flip it onto a table and play the treble side like a synth.