Insects aren't any more efficient than chickens though, especially American chicken. Some insects, for example, mealworms can be more efficient than chickens on certain diets, but I think the complications, i.e. that they're so small and thus harder to deal with mean that it's not going to be worth it.

But I don't want to characterise myself as knowledgeable on this topic, so this isn't the answer you and instead something which you can hope will provoke somebody to give you the real answer.