Hi op. I won't comment on the trip abroad as you've had lots of advice, but more about divorcing as a sahm.
My sister divorced in similar circumstances two years ago. It took a year for the divorce to go through. Basically all assets were put into the pot and divided, 60/40 in her favour.
She got the house (equity), some of his pension, and a small amount of cash. He pays child maintenance, and spousal maintenance for five years, to allow her to prepare for full time work. She claims tax credits, family allowance and council tax relief I think.
This was only possible because he was willing to keep his name on the mortgage, because her mortgage provider wouldn't let her take it over herself (they don't take maintenance into account). If he hadn't agreed to this, she would have had to look for something much smaller and take out a mortgage with a provider that did accept SM.
Similarly, if there hadn't been enough cash in the pot, the house would have had to be sold in order to release his share of the equity. A case can sometimes be made for the resident parent to stay in the family home for a number of years, even until the children are 18, but it depends on the size of the home, the monthly cost of the mortgage, his ability to adequately house himself.
For example it would be difficult to defend remaining in a huge six bedroom home, or argue for SM to pay a £3k pm mortgage. Much easier to justify staying in a modest 3-bed home, paying a £500pm mortgage because if you sold it, you'd still need a 3-bed home and the mortgage/rent would be no cheaper.
Until all of this was settled, for about a year, he continued paying his full wage into their joint account. It was a struggle to run two homes, and their savings were hit hard, but at least he didn't leave her penniless, he was very decent actually.
You obviously do need proper legal advice about your specific circumstances, but HTH.