Yes, I'm quoting myself, just to make sure this point didn't get missed.
True, if you want something like a Roland V-Accordion (where the target market is mainly people who already own/play accordion), but cheaper, you'd want bellows of some sort.
But I'm advocating for something a little different. The target markets here are 1) people completely new to accordion who want to "test the waters" without gambling a lot of money, and 2) accordion players who want something inexpensive/portable/light they can practice a bit on, perhaps with headphones on in the middle of the night.
Once you get rid of the bellows, the whole thing gets a lot easier to make. Now you're
really in the neighborhood of that $50 department store Casio keyboard. The beginner can learn how to work the keys and buttons and get their hand independence going. More importantly, they can decide whether or not to eventually upgrade to the real thing.
Again, this is just like a practice chanter is to the bagpipes. They're not the real thing, but still, beginners use them to learn the fingerings and coordination first, and then later (if they enjoy it) upgrade to a version of the instrument where they finally get to manage a big air pump. And even experts use practice chanters sometimes for the convenience and relative quiet.
Think of the commitment someone has to make to become an accordion player now, and the hoops they have to jump through just to start out. Now imagine that they could pick up one of these "practicordions" at Target or Walmart (or whatever the across-the-pond equivalent would be) for the price of a video game. The resulting demand for real accordions from the percentage who "caught the bug" from the starter gadget could potentially be significant, and that would benefit us all.