Touching up a convex edge is as easy as any other type edge and does not require a belt sander or any specialized equipment. In SHTF situation, you won't worry about "messing up" your convex edge. Some of the finest survival knives in the world, including Fallkniven, use the convex edge. BTW, before I got my BRKT strop, I used an ordinary crock stick or ceramic rod for touch ups. You only touch the very edge itself. But if all you had was a flat sharpening stone, it would work fine, possibly creating a secondary bevel, but who cares? If you look closely at old hunting or kitchen knives that have been hand sharpened for many years, you will notice that the sharp clean secondary bevel edge is long gone. Years of use and hand sharpening at various angles has produced a convex edge that usually cuts even better than a factory bevel did anyway.