Doesn't "I do not wish to separate" negate the whole premise of the last resort where you have to be willing to walk?
The first time my W filed for D, I worked with one of the DB coaches found elsewhere on this site. She gave me guidance on using a version of the LRT. It was something like "To me, divorce is not the best solution to our issues. I understand you believe it is. Because I love and respect you, I recognize I need to let go".....or something along those lines. If MWDs brief podcasts are still availabe on iTunes or Google, she has a better version of this that I think I quoted in one of my prior posts. The point is that you are owning your feelings while validating hers. I hope you have a copy of DB or DR where the LRT is discussed. It might be a good time to revisit it. MWD also has a YouTube video or two that covers it but the podcast was the best IMHO.
Regarding the rotating living arrangement, have you talked with an attorney about what legally is best for you? I believe DNJ references this is earlier in this series of posts. It is almost always a bad idea for either parent to "move out" in any way.
