I'm pro choice, but I'm also an IVF girl so aware of egg quality decreasing with age. When did you guys plan to have kids? If your husband is finished studying now he should be able to keep working and earning money. You might need to move some place cheaper. Near public transport though 🙂.
End of the day if you want this baby, things will fall into place. If it costs you your marriage was it worth saving in the first place? Like the second he doesn't get his way it's over?
I would probably be like delirium and wouldn't come back from the UK. The baby sounds nicer than your DH. Your sister and parents could mind him while you study. Maybe present this as your solution to your DH and see if his attitude changes.