I have multiple gauges with varying curvature. I fear that if I use a flat stone, the curvature might get irregular.
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Find someone with a Tormek sharpening system with the woodturners kit, and beg to use their Swedish shapening marvel.
Mini belt sander/sharpener, belt should contour to the blade shape. I got a cheap one from Amazon works well for most tools.
https://www.amazon.com/gp/aw/d/B07CVN8HV5?psc=1&ref=ppx_pop_mob_b_asin_title
belt sander removes too much material very quickly
Variable speed and fine grit. I have used the one I linked a ton to sharpen all sorts of tools. Also it’s literally listed as a tool sharpener.