>>24555103
I do not believe that the Japanese accent is the most accurate analogy to explain the way in Greek, the accent does not “linger” in the same manner, especially in poetry when metres are highly restrictive and somewhat artificial on the delivery. There can be synecphonesis, that is an incomplete coalescence when two vowels are realised as one long syllable, which is commonplace with ‑ε‑, but that only means the sequence is to be treated as one, abnormal note accent-wise.

A regular system is enough. I tried to write down the same verse in Paint, which is a better way to see how the accent react, in my opinion. I don't think Japanese is too relevant here. Note by the way that a—rather crude—system of ancient musical notation has existed since at least the third century BCE. A comprehensive and critical discussion of the ancient notation is found in Egert Pöhlmann's “Denkmäler altgriechischer Musik”, Nuremberg, 1970, which provides an edition of forty-or-so passages—mostly papyri findings from the Hellenistic period—accompanied by extensive commentary. For the origins of the system, also relevant is Martin L. West, “Ancient Greek Music”, Oxford, 1994, 259–63.