What would it mean for consent to be primitive here?
Rights aren’t a primitive notion. They’re always derived from moral principles. Also, there are rights that are non-transferable even with consent, so consent doesn’t capture all rights.
In metaethics, there are 3 types of ethical theories: rights-based/deontological, consequentialist and virtue ethics. Consent is from the rights-based/deontological tradition. There is no consent-focused ethical theory that isn’t rights-based.