So I'm just going to be redoing this calc with GPE rather than straight up KE since it breaks the KE rules. We already have the total mass of the dust (6.0807185e+15 kg) and I'll use the average height of the dust clouds I used in the calc (72584.0316544 m). Based on that, the GPE of the dust would be:
E=m*g*h
E=6.0807185e+15*9.81*72584.0316544
E=4.3297717e+21 J or 1.0348402724665393126 teratons (Small Country level)