My name is Black Kitty!

We live in a rural area and Black Kitty showed up about 5 years ago and think he's about 9 y.o. He is, by far, the sweetest cat I've ever known. We didn't want a pet, but he really wanted us so we kept him around. He never wanted to be an inside cat, though. His "home" is definitely our back porch and yard. He will come inside during extreme winter weather, but refuses to use a litter box. He has never once peed or pooped in the house, though. He simply goes into what we call "hibernation mode" and only has to go outside to potty once or twice a day during those times.
He's getting older now, as are my husband and me, and he wants to come inside more and more. We don't have (and don't want) a kitty door, so it's becoming a lot for us. We also travel a lot and struggle to find someone to take care of him while we're away. I'd love someone with a big property and a kitty door who would like a sweet indoor/outdoor boy. If no one wants him, we are perfectly happy keeping him.