I think you will struggle with this to be frank, and not due to a minimum dividend level, but the fact that you have all of the debt and your wife has all of the equity.
I had a case rejected (my first for over 6 months) a couple of weeks ago due to this very point. We were offering all of the lady's share of equity in her property, by way of a remortgage, but creditors wanted a share of her husband's equity - and he was genuinely not responsible for any of her debts.
One creditor did not believe this argument and rejected on this basis. She is now declaring herself bankrupt and the return will reduce considerably, and she is absolutely distraught, and her other creditors are not happy as they gladly accepted the offer.
Regards, Melanie Giles, Insolvency Practitioner