What I have done so far is trace over an image of the sunburst, using a series of smooth paths for the flames and circles for the, well, circles. I barely know what I am doing with the CC3 software so this is taking longer than it should. I need to figure out how to do fills.
You know how Norris' sigil is a sunburst with a horse's head? I figure with a CC3 structured drawing version of the Imperial Sunburst, it would be easier to make other imperial sigils.