I had 4 wethers for 10 months and now have two gimmers, which have been mine for a year. The wethers were from a farm and weren't tame but although nervous they didn't climb walls at any time. Once they'd settled they'd come up near me when I was bringing food - less standoffish than your NCCs, I suspect

I have found I need dogs that can work at a distance - if you press a primitive, it's going to take flight, and jump like a deer if it has to. But if you can keep things calm and steady, they are quite manageable.
My two gimmers came from a children's farm and are tame as anything - as you can see. They are very friendly and I have found them no problem to manage. Unlike the Manxes and Shetland cross sheep that I also have, the CMs have never to date climbed a wall or jumped a fence. They have, along with the others, squirmed under a fence to get to better grass, but only when they were on slim pickings; when they've had plenty to go at, they've behaved well.