I just noticed something else that would improve this.

You only really want the money back for when you need to support your family and such. The rest is just to give them incentives. The obvious thing to do would be to have them pay you a certain amount back no matter what so you don't have to absorb that risk, but that would ruin their incentive. To fix this, add a second company. They pay a portion of your premiums, and if you die, they get the money that you don't need.