I've been vegetarian for over 30 years and I'm a smallholder. I wouldn't say it pays a living wage, it doesn't, but my needs are far less than most folk that work in offices to pay for their food and I reckon my lifestyle is way better.
There is a difference between killing animals for meat (which I can't) and euthanasing a sick animal - I can't physically put my ponies to sleep when needed but I can and do hold them for the vet so I am with them to the end and that doesn't compromise my beliefs in the slightest. Ditto the hens, working cats and any other animal I have in my life - I can't do it myself but I find someone that can do the job properly and efficiently for me and I make the decision to let them go.
If it's just the meat side that is a no-no for you then go for animals that don't enter the UK food chain - ponies, donkeys, llama, alpaca, laying birds, caged animals/birds, tropical fish, reptiles.. plenty that males are sold as pets or for breeding rather than eaten. Castrated sheep as lawnmowers and wool providers likewise, or females as long as you're not breeding and selling youngstock, or if you're taking on a breed where more go for breeding (?a rare breed perhaps) than for meat?
And yes, orchards, fruit and veg, arable crops in small quantities. hay, fibre crops, cut flowers, plant nursery, all potential areas to explore depending on your preferences. I viewed a 15 acre holding years ago where their main crop was salad leaves, supplying bagged selections and individual types to local restaurants on a fresh daily basis. Just a polytunnel and an old caravan for weighing and bagging, a label on and a van to deliver. The rest was rented for sheep grazing I think, income for grazing can be meat or breeding or pet stock so you can decide what your tolerance is - I am happy to let grass for sheep that belong to and are killed by and eaten by others, just can't have sheep of my own and sell them for meat.