Merrick,
Just wanted to stop in and say I'm still with you Brother. I'm sure it is time for the next step, but before you take it, are you still on the path of all your previous steps?
When I took the time to review my 180s and doing something differents, and acting as-ifs, I realized that I had strayed way off course - so the "next step" really wouldn't be a next step, it would be a jump into the destination without walking all the way down the path.

Walking down the DB path is difficult, troublesome and easy to get pushed off of. We still have a happy destination in mind, but W has a different destination in her mind.

The trick isn't how to get W onto your path, it's how to get her to even recognize her path can lead to your destination - a happy M.
I think S throws both of you off your paths and gives you a chance to re-evaluate where you are going. It takes W off her path because her path is not based in reality. Make sure she has an opportunity to see the destination you desire before you S.

She will not appreciate it, but she will see it. And if she sees it consistently, it will make a difference. It might even make a difference before you have to physically S.
I do think you are better off deciding how you want to implement a S as part of your DBing, and implement it, rather than play her game and try and get her buy in or ownership of a S plan. Trying to get her participation only plays into her game - takes steps along her path, and provides some certification of reality to her alien world.

God Bless

plk