Yes to all of those.Could they be butchered and used like tiny Cornish game hens? (How DO they clean those things out, anyways?) Or even as dog food? Or chicken food?
Some people butcher Coturnix Quail (adult live weight often about 6 ounces). If you are dealing with very small chickens, you might look for threads on butchering and cooking quail.
There can be shortcut processing methods that save time as compared with the "usual" methods. For example, if you intend to cut the bird up anyway, you can cut it wide open to get the guts out (much easier than trying to work through a small hole.)