I decided to fix my broken IIIf even if it doesn't make much financial sense and sent a message to Youxin Ye describing my problem. Instead of taking my money, he answered promptly with easy-to-follow advice on how to fix my issue, and it worked!
Off to shoot some film! And since UPS lost my previous roll, I guess I will have to develop it myself...
It is very generous of him to give free advice when he could easily just take the money.