I converted this to 3-pole by omitting the tip. For mkII I will keep the tip for mechanical reasons, GoPro puts out only one channel of audio for live view, so we just need the first 3 poles to have conductors attached.
The motive was to be able to have live video out while using the waterproof case, and it works! I bring the wires through the back of the case, where they are sealed and a servo lead terminates on the outside. This position is a neutral point for the tilt and roll arcs, a great place to make a connection!