Well this may sound harsh have you not considered allowing your child to be adopted by your spouses family so they grow up in the Uk?
From what I read you dont wish to remain married to your Spouse who from what you say cant live in the UK due to Debt issues. So I cant see how you can live in the Uk yourself unless you get a Job there.
I dont know if its possible to do and if you would wish to do it but just another route you might consider.
