You are welcome to do the normal thing of getting a loan and using benefits to pay for it, which is basically what you are trying to to do but there are 2 separate institutions. One to track the payments to you and the other to track the payments to your loan.

If you want to buy someone's benefits, give an advanced loan or have them put the benefit payments into an escrow account that will pay out to you. You are trying to short circuit the system and there is no need or reason to. What you want to do is already available but it's using different financial instruments.