I'm afraid I can't see any upside for you at this stage.
I should point out I think that the stain on your credit rating will last for 6 years from the date of approval (assumed March last year?). I'm not a credit rating expert but don't think it will be just a case of building up a credit rating - that will be extremely difficult within the 6 year term I think, so any mortgage you can get throughout that period is likely to be sub-prime.
On the assumption that your total contributions are less than your total debts, you are already in effect in a scheme that is tantamount to an interest free loan. Given that the amount you would need to raise at this stage would be not far short of the total, I doubt the wisdom of doing this, particularly as your family member would have to borrow the money, with its inevitable interest. Presumably you would have to pay the money back. I wouldn't be surprised to see the monthly repayments exceed the IVA contributions or, if not, to outlive the IVA term.
Arguably that money might be put to better use in helping you buy somewhere after your husband leaves the army. However even then you would be borrowing the deposit. If you combine that with the possibility that your husbands earnings will reduce in the short term when he leaves the Army, there is the potential for overcommitting yourself from day 1.
Frankly, if you can afford the contributions and you are discounting your debts with it, currently I think your best thing is to remain in the IVA. Maybe look at it again when your husband leaves the army, or is about to do so, but bear in mind the points I make in the preceding paragraph.
Sorry it's probably not what you wanted to hear.
Ian
Ian Millington
Insolvency Director
PDHL Ltd (formerly Personal Debt Helpline Ltd)
www.pdhl.co.uk