If she's like my W and you're like me, she's used to getting her way with you, and knows how to push your buttons.
If it were me, and she tried to engage that, I'd simply ask her what she would like to see, and respond with nothing more than something like, "Since this is such an important decision with long-term consequences, I will think about it, talk with my attorney/advisors/whomever, and get back to you."
Even if you want to agree with her or actually do, I would say and do nothing, and commit to nothing.
That might also be a good 180 for you. The way you show her you will be ok without her in the future is to accept that, based on the current situation, your future does not include her so you are making the best decisions for you and the kids.
Keep to the high road. Lead. I hope it doesn't turn ugly too but if it does, be cool, detached, and calm and it will ultimately work out for the best for you.
