Sorry - did not mean to embarrass you, and the background information you have provided is useful to understand the causes of your husband's current debt problems.
Your first priority is to your family, and given that you have had some difficulties in the past that you are now resolving with hubby, that has to be your number one concern.
Children are so precious, and as parents we can only do our best by them to give them a good start in life. If you don't feel that the state system in your area can provide this, then you must follow your instincts in this regard, even if this means that you have to address your husband's debts in a different manner.
It will take him a long time to repay his debts under a DMP, but you can always consider an IVA in the future when the children have finished their education - however I rather suspect that with the savings you will make on these costs you will be able to repay the debts at a much quicker rate.
You are clearly a fabulous Mum, and with some discipline in the household budget (perhpas you ought to take over the finances!), and a good DMP provider behind you, I am sure that you will work this out. But do let us know how you get on with getting the creditors agreement to your plan - which after all perhaps offers them a better solution in the long run if they will eventually get paid in full.
I sincerely wish you the very best of luck.
Regards, Melanie Giles, Insolvency Practitioner