I've been playing with horizontal sheaths lately (carried on the weak side, kinda like a cross draw setup). So far, it's very comfortable and easy to get to with either hand. However, learning how to open a double-lug Sebenza with my off hand is taking a bit of practice.
I don't have one for the 31 yet, but it's on the way from Canada.
Here is a Mnandi sheath I received recently. It's clipless. The idea is that I always have the Mnandi in the same place (strong hand) for clean work (food, letter opening, etc.) and can carry larger knives either in the strong side pocket with a clip, or cross draw on the weak side when I'm in the mood.
View attachment 2309215
I only tucked in the shirt for the picture. Normally the shirt hangs over the gear. Hides quite nicely. When the 31 holster arrives I'll post it up if anyone wants to see it.