Helltooth would be the perfect build to try this with. Literally 90% of the gameplay is standing around and avoiding shit while your Gargantuan's obliterate everything for you. Providing you avoid affixes and adhere to the minimum kite range there's nothing stopping you from going for circles.
On that note, I've been messing around with Helltooth and I think that Soul Harvest usage could do with some serious love. As of right now it seems like the limiting factor in how well the build is played by the bot. The primary issue is that while finding packs and skipping mobs Soul Harvest isn't cast at all. With Lakumba's giving a whopping 60% damage reduction from 10 stacks as well as the Armor that Soul Harvest gives per stack, you get absolutely obliterated if you try and run with trash mob size set any higher than 10. Since it only starts casting once it hits set minimum density, you run the risk of having a lot of Soul Harvest downtime. The other thing is that even in combat it doesn't always seem to prioritise gaining or refreshing stacks. Sometimes it'll afk near an elite pack with no stacks at all, making no attempt whatsoever to go into melee for stacks (if it happens to be near dense mobs it'll cast it, but it certainly doesn't look for opportunities). Maybe the kite settings, 10-15 yards, are affecting the in-combat usage?