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The problem with the Naniwa lapping stone, much like the Norton version, is that it is meant for Naniwa stones, which are known for their particular softness. It is not an ideal choice for an...

True, but from what I've heard they are of varying quality; some aren't even very flat. They are fairly soft and are to be used with Norton hones only.

DMT also makes a 220 (and even a 120 grit!) plate as well, which comes recommended for lapping really hard hones (like barbers hones). In reality you probably won't find much use for the 220 grit...