Any way to smoothly model triple junctions?

Since there isn’t a three-sided half-stage-rotation option, I’m not sure how to smoothly model the location of the centerpoint of a triple junction. As is, I have to guestimate the center of the three ends of the ridges for each time step, then go back and connect the line topologies to a static point at that guess location, which causes the centerpoint to jump around to different locations completely nonsmoothly every timestep.