Well, let me share this experience. We've had a variety of feral cats that hung around the hay shed for a few years after we bought the place, which we put all through the local spay-neuter-release program for feral cats. We had 2 that stayed around permanently and ended up about 20% tame/80% feral, but lived in the shed and moused for their board. Sadly they both reached the end of their lifespans last summer, so my wife insisted that we needed another mouser before we were overrun with rodents.
So off to the humane society we went. They had a cat they said was a "working cat", and got surrendered because the previous owners couldn't keep her in the house. She had been there for a long time, and they told us they would waive the adoption fee for a donation, so my wife said "$200".
O.O
And home we went with the "working cat" to find out that she doesn't really want to leave the garage, so I guess we broke her. She hates dogs, and hates other cats, and will bite you if you try to pet her for longer that 2 seconds, so what to do. Once in a while lately she ventures out, and before the snow the last couple weeks, I actually saw her laying on top of the hay stack in the shed, so maybe there is hope. I hate to just lock her outside as the coyotes and other feral cats are prolific around here.
In short, I guess the pound might solve your problem, but if they ask for a donation, step hard on your wife's foot.