I’ve heard fishing line will keep out deer, has anyone used it who can confirm or deny?
I have never used, or heard of, fishing line to keep out deer.
This year my raised bed gardens have been hit hard by varmints. Lots of early growth damage done by rabbits and squirrels. I had to build wooden frames with chicken wire on them to protect the plants.
Next year, I plan on having most of my raised beds covered with chicken wire frames on all sides and tops. The top chicken wire on top will also keep out the deer from eating the plants. I have used that on my young bean plants for years and that keeps out the deer.
Growing your own food can save the family lots of money, but this year I lost too many early battles with the squirrels and rabbits and would have to admit that I probably lost money trying to garden certain plants. I certainly lost lots of time, effort, and money due to varmint damage. In response, I will have to spend even more money on building protective cages to put on top of my raised beds.
I look at unwillingness to butcher...

I learned how to butcher small game animals before I ever learned how to raise them. I learned how to butcher small animals from my grandpa, who was an avid hunter. So, I knew how to clean fish and butcher rabbits, ducks and geese long before I ever learned how to raise them. I have no fear, or hesitation, in butchering the animals I raise. So, I am thankful I learned that skill when I was a young kid.
Having said that, I understand how some people may not be as comfortable in killing and processing small animals. Especially if they have never done it.
My suggestion would be to get a few meat chickens, don't treat them as pets, and then butcher them at around 8-10 weeks. You would quickly find out if processing your own birds is something you can do. I think it would be a lot harder to butcher your favorite hen after you have been feeding her for years and know each and every personality of the girls in your flock.

I don't treat my backyard flock as pets, but I have to admit that I had one hen that would run up to me every day and want to be petted. That is very unusual because I make no effort in trying to tame my birds. She got sick and died, but I was kind of glad she went that way. I won't butcher animals that get sick and die. It saved me the decision of having to butcher her later on. It would have been hard for me to butcher that hen, even though I have butchered many chickens in my lifetime.