Well, after running through a few different ideas to make the fog. Including using sprites, as well as textures rendered on geometry planes. I settled on adding back in the very simple atmospheric fog to kind of "wash" the scene. As-well as making use of the volume primitives again. This combined with a 3d texture makes for an acceptable fog effect, taking a cue from the Maya fluid effect, I am going to use an expression to control the timeslider that will animate the fog. This solution has provided both a reasonable aesthetic outcome aswell as a reasonable render time.
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