chicken bones are just not that hard. Especially if you have the right kind of grinder. I figure I've made money by now on my grinder, it's a Maverick, cost $99.00.
I buy chicken backs and necks, chicken livers, chicken hearts, even chicken gizzards. I make sure that there is at least a pound of liver and heart in each 5 pounds of mix. Sometimes whole chickens are on sale so I take MY favorite parts for us people (thighs and drumsticks) and depending on the day, sometimes the entire rest of the chicken goes to the cats. Yes, they eat chicken breast, at 99 cents a pound. Compare that to commercial catfood!

If you don't like messing with meat, it's not going to work. I don't mind and my cats sure love it.

ps great kitty picture and it's good that you've figured out BEFORE your cat gets obese that dry diet
isn't going to work for him in the long term.