Patience, my brother. We are both hanging on to sinking ships with ice cold water whipping our faces hard. We will jump off soon, this ship that they think is so wonderful.
I agree with OwnIt and roist. Do NOT assist in maintaining her relationship with the children. It was hers to break and it is hers to fix. Validate her concerns, do NOT aid her in any way.
My STBXW goes so monster on my S9 and S5 every morning just getting them ready for school that I want to distinguish myself as a different kind of parent than her.
By assisting her in maintaining good relations with your kids, in an offhand way you are validating her MLC behavior by showing support for her, this is only going to confuse the kids even further.
You've been playing it wonderfully. Keep at it.
Also, I'm curious...you said you don't want your house (I don't want my house either). What are your reasons why?
M: 49, W: 45 T: 22 M: 15 S14, S11, S9 BD: Jan '16 W files: Oct '16 D final: June '18