You need to communicate with your W about the kids openly and clearly. You said that you don't even know if she has received the proposal, let alone had time to go over it with a L. It sure seems like keeping the kids away from her until she agrees to something is HIGHLY controlling. If you are worried about the safety of your kids it might be justified, but short of that it seems inappropriate. Why does the L think it is a good idea not to let the kids go with her?

You need to tell her that you would like to talk about a childcare plan, and then explain what you have drawn up. I don't think doing it with a metaphorical gun to her head (not releasing the kids to her) is a fair way to negotiate.

W 34 Me 42
Married 7 years together 8
0 kids 1 beloved dog
BD 4/6/2018
I moved out 4/7/2018
I moved back in alone 8/05/2018
I file 3/06/2019
D official 5/7/2019