You can also pressure can (or just pressure cook) your meat, which will help make it a bit easier to chew. I've also heard you can put it through a meat grinder (hand cranked ones at yard sales for $1, probably find one to trade) and make ground chicken that is pretty good for stuff like tacos. I haven't tried that one myself yet.

If you have any growing space at all, kale is a fairly high-protein crop you can feed your chickens that grows prolifically just about everywhere. Various types of worm and bug boxes can be used to grow some high quality meat protein for your chickens, and they can be built with wood scraps and twigs.