If any person advances money to provide for the payment or retirement of the bonds of nonconsenting holders the legislative body may deliver at par all or any portion of the refunding bonds which are not to be delivered to consenting bondholders to the person making such advance or advances, or may sell at par all or any part of the refunding bonds not to be delivered to consenting bondholders and from the proceeds thereof reimburse such person, and may contract to make such sale or delivery.