@PolyplaxSerrata I did this with DH before marriage and before kids though. We banked his salary in entirety because his package paid for the rent and utilities while there. Also had a flight allowance and a cost of living payment based on a western bag of groceries bought like for like in an expat supermarket. It was the most lucrative phase of career so far!
However it was haaaaard, emotionally and trying to remain connected. We had a big time difference that meant when we could talk, one of us was heading out, going to bed, middle of breakfast, or generally in a rush or signal/connection was poor.
It was cheaper for me to visit him than vice versa, so I went out a few times. When I did, he took annual leave. For me - it was a holiday. For him - it was just days off where he lived, so we begrudged each other a bit then and found middle ground visiting nearby places. I wanted to go to all the places he'd told me about and experience what he was day to day, he didn't because it was his day to day. He became a much more confident person, noticeably so, and I was the opposite. I kind of shrunk into myself a bit, probably because I was jealous of his situation.
When he returned, the reverse culture shock he suffered was humungous. He sank into a deep, dark depression (suicidal). It was awful. That lasted almost as long as he was living away for.
The whole thing put a massive strain on our relationship. I'm not sure I'd do it again and with kids.
We did gain a lot financially from it, it set us up for life, but I really don't know if I'd take the risk with the wonder of hindsight. Definitely wouldn't if kids were young.
Since you mentioned pensions, check what his tax status will be living abroad, and look up national insurance equalisation. Will he earn in GBP? My DH had to do a national insurance equalisation thing, so his state pension wasn't negatively affected by him being abroad.
Good luck. It's a tough decision to make.