Opened up man_to_man_indicator.SCNE in blender and pushed the arrow z-axis down -1500 so that the blue man assignment arrow is off screen.
Also opened up man_to_man_indicator.SCNE in notepad and put all color references to 0.0 alpha -- [1.0, 1.0, 1.0, 1.0] --> [1.0, 1.0, 1.0, 0.0] ------ not sure if that helped or not
anyways, noticed that there is a indicator_turbo.SCNE .... didn't have time to fiddle with that in blender.
original mod by michaelvlutz49, just edited out the blue arrow.
preview before:

preview after:

let me know if it don't work.
download: No icon + ring indicator Blue arrow removed