v4 is available here: https://alltheflavors.com/recipes/22318#shurb_by_captaincannibal
captaincannibal's SHURB clone.
"No steeping required, though a day or two will really help it out. Otherwise, shake until it turns white and your arm becomes a noodle and then enjoy the smooth, dark, enigma that is Shurb."
"v4 is already in the works. I've got some great suggestions and ideas for it. I already have a lot more notes written up and I'm fairly sure I figured out the cream base's percentages finally. Expect to hear more sometime next week if my new flavorings arrive."