This is very disturbing. I hope you understand how I mean this: It's not really a big deal to me whether your hens are laying you eggs anymore. I'm on these boards because I really do love chickens, their personalities, their wonderful mothering abilities, their quirkiness. The eggs they lay are nice, but they are waaaaay down there on the list of why I keep chickens. There are probably a lot of other people on these boards who feel the same way. Please find one of them near you who wants to save a life or two. I'd take the hens, but I'm in CA. As much as I would like to, I'm not going to be able to get them here unless you know of a way to ship them.
I'm not usually so pointed as to speak this way, but it really does seem very greedy and cruel to kill a being who has been so giving to you for two and a half years. I understand this is probably a business for you. But even if that is all it is to you, when you decide to get rid of your hens, please go to a little bit of trouble and find them new homes. It's the right thing to do after all the eggs they've laid you, and I'm sure somebody will love them.
This is my most honest answer to your question. You said you love your hens. Don't kill them if you love them. I know you can find a better solution!!!