Yes children are blameless victims that have to put up with the fallout of D. They have no say in it and definitely didn't cause it.
I hope the nanny situation will give you the time you need to find another solution. Plus between now and August a lot can happen/change.
I think that you will find that both you and the kids will adapt to whatever situation. It may be a pain and definitely not ideal, but ye will adapt and make the most of it.
Best wishes
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together