This looks really fun might pick up a Evolution Brush to try this out I was using a Paasche H and pressings the trigger half way down then adjusting the airflow for different sized splatters.
With gravity feeds you can create spatter just by under-adjusting the air pressure, no hardware needed. With pretty much any brush you can make spatter just by holding something like a pencil tip in front of the needle: anything that fouls the air/paint stream while still letting it pass will cause the stream to form spatters.
A special tip isn't needed, and having to swap it on and off would just slow you down and add unnecessary complication.
Forgive my ignorance, but I thought the thurisaz (thor) rune pointed to the right, not the left? Or.. maybe, Is it ymir... ? Hmm. Just curious! Thanks!