I have gone to suggesting that individuals raise funds doing the very thing a choir prepares to do in a tour--performing the pieces on the program. A member of each of the other sections could accompany the one who needs money, and schedule the ensemble for a series of performances for church and community group luncheons, socials, meetings, etc. A collection plate on the table, at the entrance/exits, or passed around the audience/congregation may work better than negotiating a payment, which would be considered taxable income. Network through members in the choir, and a lot of performances can be arranged in a broader geographic area.