I see we both speak from our own experiences and from different ends of the spectrum,so it's good we can offer T our varid opinions. I think you are right that if a WAW is determined to go, well she's gone. However if T wants to turn things round i think it's clear he needs to do somthing different cos what he is doing now isn't working. So if its "act as if" or kick her to the kerb and find a new partner or become her bestist buddy, somthing has to change.
I agree with your point that T acting as if he really didn't give a fook is a good step forward, but how close is he to that. I would also add that not giving a fook plus improving himself and his own well being will set him well on his way and he may find that he doesn't actually want W back anyway or she may come beating down his door wanting back in.
So I would say "Stop going down cheeseless tunnels", "Work on you", "Stop doing what doesn't work", "act as if", "Turn a few 180's" all DB cliches , but all basic DB principles.