Thank you all for chiming in! I smiled at a couple of the suggestions, maybe shouldn't say exactly which ones.
The meeting yesterday was OK, although I was very surprised at the stance STBX is taking on some things. For instance, he tried to pass off Thanksgiving as "just another Thursday" where he normally wouldn't see D12 until after school. That way he could spend the morning with the duck and her kids. I said I'd love to hear him explain to D12 that he can't come over and make apple pie with her because he's spending Thanksgiving morning with someone else's kids instead. He backed off pretty quickly for this year, but made it clear that next year won't be the same.
He's also balking again at us being in Rockport together next summer, and this time he spelled out what he didn't say this past summer: the duck doesn't like him being there with me. Heck, if I were her, I'd be insecure, too. She knows better than anyone he's a cheater. I wouldn't trust him if I were her.
Overall, things didn't go as well as I'd hoped. We came to an agreement on the things we discussed, but he didn't like it. He's getting nagged, and that's going to affect my kids. And I'm going to say it one more time, if he'd get rid of the duck and start dating someone else, we'd get the blended family of the year award. Plum sauce, indeed.
We have another meeting in a couple of weeks to get to the issues we ran out of time on yesterday.