Right now, even though you are offering to make whatever "accomodations" your W needs, so that you can be around your kids, she is hearing it a bit differently.
She is hearing you using the kids as a way to keep her close to you. It is a guilt trip, that many people use to keep their marriages together unfortunately.
While I don't think it is fair that she is so far away, and hopefully that will change in the future, right now, she isn't ready to see anything other than you trying to have your own way.
Go see the kids. Enjoy the time with them. That is what this visit is about.
Just enjoy the kids.
"Acceptance doesn't mean resignation. It means understanding that something is what it is and there's got to be a way through it."--Michael J. Fox