Distributive Reason, Legislative Reason, Duty

Instead of reinforcing conventional Moral of Duty, by casting Rational Morality as structurally deontological, Kant might have taken the opportunity to present a critique of the former, i. e. by showing that the only duty worth acting upon for its own sake is rational duty.  To that end, instead of treating focusing on the subsumability of maxims under the formulations of Legislative Reason, he might have emphasized that maxims themselves are the source of laws.  For, as the basis of the creation of a law, a maxim is clearly independent of antecedent convention.  Thus, more generally, Distributive Reason, as the form of Examplification, more effectively liberates an individual from convention than does a Totalizing Reason, to the product of which one might have a 'duty' to submit.