Help with turning a Curvature map into a mask for edge wear

Hey scribbler!
Yes I’ve tried SD out, however it’s out of my price range as a student.
I’ve managed to get the Edge wear to a stage where it works and i’m happy with it. Here’s a comparison between the my material on the left, and a texture i made in DDO on the right.

I’m actually happier with my edge chipping than i was with the stuff baked out from ddo

I’m now trying to work out how to restrict/mask the grunge on my material.
I don’t want to have to paint custom masks if i can help it. Does anyone know if there is a node that can blur the image? it’s the only way i can think of adding more depth to the edge chips and also for creating the mask for the grunge and rust.