Help with rubber stamp making

Hello ! I’m new with Lightroom (and with lasers) I try to make a rubber stamp but I can’t do exactly what I want. For example, I am trying to use the ‘ramp’ function but I would not like this effect on the outer circle, the outer circle is the line for cutting (image 1). If I put this outer circle on another layer (red) to cut it, I no longer have the inside of my drawing filled with black like on the picture 1. How to do ?

Add an offset to the existing black outer circle, to push the line that gets sloped outside the stamp, and make the original line red, like this:

The preview looks the same, but if you zoom in, the cut line is now inside the sloped outside edge:

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