I found that the "Surviving An Affair" book does this really well. It takes the point of view of both BS, WS, and OP in several italicized passages. I found these to be very realistic as far as interpreting the mindset of each of the players in everything. For that reason, if my WW ever decided to come back, I would ask that she read it. I'm even tempted to give it to her now, but while she's deep in the fog of an A I doubt she'll really get a lot from it.
Good for you, though, MOWL -- I can't really address your seeing a GF now, I think it's more of a choice you need to make, GF or XW, not really to play one against the other, but I have seen that some MCs recommend a BS get a significant other to snap the WS back into recovery. I know that goes against MB principles, though.
Anyway, I like your thoughts from your WS's point of view. I'm in a similar situation, if not worse. If my WW were to come back, she'd likely have to quit her job (as OM is co-worker) AND all her friends, as her new friends are all part of a circle with OM. In a way, it's a GOOD test though, for if my WW is willing to give all that up to work on our M, it's saying something to me. It also may be the reason that she's still deep in her A, as I think she knows that it's not as simple as dropping the OM and coming back to me, she's got a lot more to lose.
Hopefully you and your XW can both work out a nice plan for recovery. The fact that you're at least putting yourself in her shoes should be very helpful to you both. I hope to be able to do the same someday.
ALS