(a) I am pretty much ok with using concepts from the past, but it depends on how clear they are in the modern context. It appears that already in the past and even in his own time Epicurus was accusing others of misrepresenting him, so the essential issue is clarity. And I don't mind the healing attitude, so long as the remedy is clear. And possibly the issue is not so much "formulating solutions" as it is, in the first place, providing solid fundamentals that aren't just a response to problems but positive assertions in themselves.
(b) Only a little. I think i understand the Sydney group to be largely social in orientation, which is fine. The Greek organizations are much more philosophically aggressive, but I don't have a good fix on exactly where they are and where they are going. I am aware that there are divisions of viewpoints over there, and the place to start would be to get a better understanding of what those divisions are, which I have some hints of but am not sure I understand at this point. It appears from a distance that they probably wrestle with some of the same issues we are wrestling with, and I don't understand them to be as "rebellious" of other Greek schools as I perceive the need to be. But I frankly am not sure.
(c) I have heard people make comparisons to the AA approach, and I sense that that would be a productive approach, but I have not had time to pursue it myself.