Positive & Negative (SUB function) Brush stroke at the same time as a mirror stroke

For some shapes it would be great to create the negative brush stroke mirrored as SUB at the same time.
Like the mirror function as a transparent mesh.
Example: A brush that paints a braid texture on a layer - this brush stroke has no positive BACK.

Now when you extract the layer my braid has no matching backside.

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