hmingtea - since you are in India, I don't know what size of chickens you can get, but if you can younger chickens, they will have smaller, easier bones. We call them cornish hens here. I think in the UK they are called poussin (?). But if you can get chicks or very young chickens, rather than full grown ones - the bones will be easier. If you are getting whole chickens, save the internal organs for later. Just put them in the freezer. Organs come last after fully transitioned to chicken and doing well on it. Yes, the poops will be less frequent.
Their is little waste when fed a raw meat diet. It is highly digestible.