Why is is a question of Retro or MC? Why not do both? You would not get very many MC sessions in between now and January, but it might give you the feeling that you are working together to at least begin moving the elephant out of the room. The two are not mutually exclusive.
Or, I might suggest that you do what my H and I did while we waited for Retrouvaille. (No, not the fighting part....LOL!) We got the book "After the Affair" by Janis Spring and took turns reading the chapters and discussing it. We didn't go into any great depth, but we would point out things that we each saw in the chapter that we found interesting. It gave us a framework to talk about the affair without specifically talking about the affair. And there were some "know your partner" kind of tests in the book that we could take and then discuss the results.
This didn't solve our problems, but it helped us to feel like we were moving forward while we waited for the time to pass to get to the Retrouvaille session.
