Thinking about the whole mechanics of a mower blade, the edge you need to keep ultra sharp is the leading edge of the lower portion of the blade, not necessarily the whole thickness of the blade.
Would it be possible to drill the blade, tap it and attach a hardened cutting element to the existing blade? I know some of the old Snapper high lift system blades for rear bagging had additional wings on the trailing edge of the blade to create the high lift on a surface prone to high wear. (the quartz sand in my backyard is especially rough on blades).
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