My kids were a little older than yours when we a split and their father left and moved into his own place. Our kids had the free choice of where to live and they have chosen to live 100% with me.
It doesn’t matter how much your husband “ won’t agree “ to the kids living where they want - at their age they have the choice and it’s pretty much impossible to force then to do anything they don’t want to. So you can make careful plans to cater to your husbands ego but the kids will spoil them and do their own thing ( either subtly or overly , depending on their personality ).
My ex made a bit of a show of wanting the kids to live with him eg designated two bedrooms in his house as “theirs”. But the kids knew it was just performative.
For the first few months they went to his house twice a week for dinner at most . But they he told them that he was going to reduce the child maintenance he used to pay me as they were costing him too much to feed , so they stopped going because they thought he was an a*hole. He earns over £250k PA BTW.
Then their father gave up pretending that he didn’t have OW and she moved in. So now the kids go about once every few months for dinner when she is out and he gets them a carry out. That’s his entire contribution to parenting then and supporting them.
My experience is that most men get a new partner very quickly and a lot of the time, teenagers CBA to deal with OW / another partner trying to be nice to them. And their father pretending to be a great dad to impress her . It’s all too much drama and most of them would rather hang out with their friends / stay at home on the X box.
My kids would have HATED nesting - they like the security of their own house, knowing all the rules and routines. And my ex would have spend his time messing up the house, eating all the food , letting them trash their rooms / do no homework / never shower etc and then enjoy letting me clear up all up. While chanting “ This is what you wanted “.
Nesting also relies on both parents doing 50:50 and acting like mature, responsible, selfless adults. And is that’s who you ex is then you are unlikely to be divorcing him.