PP, you used the word "ideally". If go with what I think I know and sense about you, and watching your journey in quite awe. There is something about you possibility of you "claiming" this divorce, would not ring true for me. Even your words about a Partner for the work, tells me that you still stand for M, you still stand for what is intrinsically beautiful and special about what M is. I think you would not be serving you "ideals" and commitment to yourself well.
I have always said that endings often bring about similar or same emotions and beginnings. Life circles back on itself. It is not surprising that these questions are raised, do I stand or do I not. Do I walk away from this with or without hope. You have your answers PP, you already know who you and where you. Let you knowing of where you been, lead you to where you want to go.
I'm hoping I meet you on the road someday PP. Because I would to look you in the eye and say thank you.
PS: Remember that you may actually discover your Partner, that gorgeous soulful, heart lead, vulnerable women on this amazing new adventure, whoever she may be.