When Microwaves first came out they were huge but with a tiny cooking area and they were not affordable, and were mostly in business kitchens and a few restaurants. I would love a freeze dryer but the cheapest I have seen is $1600 and they only have 4 small trays.
You could DIY by freezing your food and then putting it in a vacuum chamber that can handle a lot of moisture. There’s a very detailed video about the second part and if I’m not mistaken you’d only need to freeze the stuff before hand to get freeze dried.
https://youtu.be/5TaKnvD5SYE