There is a surgery called an FHO. It may be cheaper/cost of your breeder donation. That is great of them by the way. Do you have a picture of the xrays? ETA - just saw you do - I am going to look at them.
Feel free to PM me. I volunteer in rescue and cannot make any promises but may be able to help.
ETA - sent you a PM with some details and information. Please take care and I hope that allows you to postpone the appointment.