It would be a conflict. Gifts are allowed from relatives of the buyers.Again, the buyers bank would not approve.
My best to you!
Your best option is to offer closing costs as part of the transaction, cash will not change hands. In terms of repair money, have your attorney hold the money in escrow ( if the buyer's lender allows), and the attorney can disburse the funds to the contractors as the repairs are made. Call me if you need further clarification. My best to you.