And yet temporary qualities are accidental in a way. To be more precise they are accidental in relation to the nature of the body they are temporalily attached to. So like i wrote earlier you will blur this meaning by changing the term.
But to change a subject a bit. Epicurus clearly takes this distinction from aristotle and improoves on it. IF there is more to be said about this it would be good idea to find in aristotle this distinction and compare it with letter to H and de rerum natura.