I've never understood why peoples' choices to go to work or not were everyone else's business.
We're in your situation op, except I'm the full time earner with odd shifts, frequent call and antisocial hours. DH is the sahp. He's qualified in his field with experience and a very specific niche skill set - he couldn't work in our current town, he'd need to work in the nearest larger city (a 45min flight away).
We could move to Other City - but I'd hate to work there and neither of us want to live there, we like our present location. He could weekend commute but I'd have to have a live-in child carer which would cost more than his salary would bring in - as a family we'd be worse off financially.
I could change jobs to 9-5 but not earn nearly as much as I do now and hate it.
The difference is (I think) that I really value the contribution DH makes to the family. Our children are dropped off and picked up by a parent. I can leave at 2am on call knowing he is there to cover child care. I can stay late for an emergency knowing he is there for the children. I can work school holidays because he's there. When I get leave over school holiday times we can all go away as a family, we don't have to juggle his working hours with mine.
We did consider DH going back to work when the youngest started school at 5 and it just wasn't feasible when you look at all the benefits the family gets with him at home.
You already work. Your DH needs to recognise this and appreciate that it's you not working outside of the home that allows him the flexibility to work in a job and live in a place he clearly loves. To lose that flexibility and allow you to work he's going to have to look at where he wants to compromise in his life.
FWIW if my husband was desperate to get back into work I would move heaven and earth to facilitate it. Luckily for me he also recognises the importance of his contribution to our lifestyle and he adores the time and bond he has with our boys.
So when people ask about his work plans, I ask them not to put scary ideas in his head! And say that he works hard enough at home. When he's asked, he says he's busy enough looking after me and our children and dogs (and vege patch and chickens and small family business) without looking for more stress elsewhere :)