If here are no funds available to pay for shop labor or replacement parts, I'd consider selling it As-Is, as a frameset with the notice that it has a problem with the bottom bracket, needs professional repair (to by paid for by the Buyer), AND the agreement that the cost of the frame would be refundable with a written letter from a shop stating that the frame had been inspected, could not be repaired.

That way the Coop still gains a little money, the frame is saved if possible, and the Buyer knows exactly what he/she is getting.