I like your idea unbidden, what if I just went with:
W, I note that you have not responded to my repeated requests that we work out an amicable timesharing arrangement that allows us both to share time with our children equally. I will discuss the financial matters between us when we have a parenting agreement in place that provides for us to share time with the kids equally.
Me-40,W-37 D7, D5, S3 Separated Oct 3/2013 T 11 YRS M 7 YRS