Wild thought.
Instead of cutting through holes, how ‘bout using a spherical bur to dimple the blade face like a golf ball?
1) Blade integrity is not significantly reduced.
2) You can reduce the food-contact area to a few per cent of original, especially if you use a smaller bur to make dimples in the residual blade real estate.
3) It’ll be easier to keep clean.
d) You could usefully restrict the treatment to the active (the right side for dextral folks) side of the blade. You can dimple all the way to tip, heel, spine, an option not available in the through-hole model.
In a san-mai blade, the cladding would provide a convenient depth indicator, assuming it’s visible freshly ground. Reduced ad extremum, perhaps someone should make ball burns from Jnats so the kasumi would reveal the cladding horizon.
Sunday morning woolgathering …