Please, advice & feedback on saving my marriage

[UKVA]

For those who have read so far, thanks. I now have a more immediate issue that requires a DB tactic. My W and I are “nesting” during our separation (one week in house with kids, one week in shared apt) which means when I am out of the home kids see me very briefly first thing when I pick up my daughter for her school car pool. School is ending soon, so that will not be required anymore. Added to that, my W is a teacher so will be off for the entire summer. As things stand right now once summer starts I would not see the kids AT ALL every other week, whereas my W will have access to them every day since she will be off work. I have consulted with kid’s therapist and my IC both of whom say that situation is unacceptable to the kids. My W, in her defense, has asked me what we are going to do about the summer. I am going to ask her to give up the nesting and allow me to stay in the house full time which she may not like very much but the only other alternative is for us both to be in the house, not a good idea right now. So my question is, when thinking this through from a DB perspective, how and when do I make this proposal? One thought I had was just to ask her to come up with a solution, since me coming up with answers is our norm and not very 180 of me. Should we meet face to face to discuss this, which would require me to exhibit the 4 Cs, or could this be done via e-mail? I was going to give her 2 weeks notice of this, which would be June 3, to allow her to either agree or come up with an alternative,. Or should I do it earlier?
Any advice or feedback would be very welcome.