I was in a very similar situation to you 10 years ago.
My then partner was divorced but his EW refused to engage about the finances, refused to work (kids were 9 & 6 at the time), he was paying the mortgage in full for a 3 bed gated development house she lived in + paying CM & all her living costs. While he was living in a tiny 1 bed rented flat.
My advice - he needs to get this to court and she needs to start contributing.
A judge will expect her to start supporting herself and the courts don’t care if you rent or own your own home.
From memory his EW wanted:
To stay in the marital home for another 12 years until the youngest was 18 & he pay the mortgage in full.
When the house was sold she get 70% of the equity.
Spousal maintenance of £12k per year. He is as earning about £80k at the time.
CM of £12k per year (the CM calculation at the time was circa £650 pm).
She wanted 50% of all his pensions. She didn’t have any as she’d cashed all hers in. He’d been contributing for 30 years & they had been married for 9.
A £3k one off payment.
She also wanted a new car.
He worked out at the time - that if she got all this + all the benefits she was claiming, she would have more disposable income per month than he had (working in a FT stressful job).
It went to the 3rd & final hearing at court - as she refused to discuss it negotiate.
She got:
To stay in the marital home for just 4 years & she had to pay the mortgage in full & all maintenance costs as she was living there.
When the house was sold she got 62.5% of the equity.
Spousal maintenance was laughed out of court at the 1st hearing & she was told to get a job.
He agreed to the CM of £12k per year - with the agreement that she wouldn’t come after him for more. She didn’t after a week of the Cory hearing so after 12 months we went through the CMS.
She was awarded wanted 50% of his largest pension only.
The £3k one off payment + new car was laughed out of court.
The judge actually awarded her less than he had through the process.
My advice would be - he needs to invest in a solicitor & get this to court. She may ‘want’ not to work or have a mortgage free house, but the system is based on needs and the gravy train is over.
Don’t move in with him until the consent order is signed as you don’t want your home / finances taken into account.
Good luck 🤞