It seems to me that this would only be of interest if it can be shown that an immoral person is not someone that cooperates with other immoral people but not with moral people.
Do you mean that "moral" should mean "someone who cooperates with others" and "immoral" should mean "someone who does not cooperate with others"? Then "moral" and "immoral" would just mean "cooperative" and "uncooperative," which we already have words for. Plus, morality shouldn't require you to cooperate with immoral people (although whether you should actively punish them or not is the eigenJesus-eigenMoses question).