> I've always thought that chickens, the free ranging kind, make insect protein palatable to humans.

In many parts of the world, certain insect protein is already palatable. To mention a few palatable insects I know of: the caterpillar stage of a specific moth species (Gonimbrasia belina)[1], locusts, termites[2] and - believe it or not - stinkbugs![3]

1. Also known as mopane worms https://en.wikipedia.org/wiki/Gonimbrasia_belina

2. capturing soldier termites is a fun, albeit occasionally painful experience for kids. Those giant mandibles can cut skin, and once closed, they never open

3. http://www.thestandard.co.zw/2013/09/08/bikita-villagers-sel...