DY I dint read your marei mekomos yet but as to your points:
1) I think they are the same but can hear more of a reason when you are essentially appointing a shliach to do somehting you view as an aveira even if him doing it is not an averia for the doer
2) Regarding cs not only is it conveivable I know some people (chasidim) who hold chalav stam treif