What do you want? If you want him helping because you're desperate to see him, then he'll end up only coming around to relieve guilt and will want to high tail it out of there ASAP. If he comes because you allow it, and are in firm control. then maybe you can play mind-gimes...errrr...I mean Divorce Bust ;-)
But, hun you CAN'T be at his beck and call. Those days are over, for good.
Can that limited contact be used to your advantage? Sure..when he's around, make sure ALWAYS look good, you control the level of interactions, you break off conversations and leaving him wanting more. Show some spine, but show some sass.
Make him so hot for you that he'll fantasize about ravishing you in the kitchen and garage. He'll want to have an affair with you!!! Be the illicit, red-hot, steamy seductress. But don;t hand it to him...make him earn it. Let him burn with anticipation.
And you know what?....you'll be able to rebuild this marriage on your terms. View this situation as a death -- a necessary death that will lead to recurrection. And your new marriage will be better than the old one.....much better, for both of you.
