Here’s a thought.
A 50 cent piece or a bottle cap from a gallon jug should be about the right radius. A circle template, or trace the razor profile on a piece of cardboard then with a compass draw circles over the tracing until you find a pleasing radius, then cut it out an trace it onto the razor with a sharpie.
If you use a black sharpie it will give you a good idea of what it will look like. WD40 will easily remove it, if you need to start over.
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