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I've been thinking about lean burn too but I'm leaning toward a more involved solution.
Thermal barrier coatings on piston tops, combustion chambers and valves, should allow running as lean as lack of pinging will allow with no melted parts. While I'm at it might as well get a dry film lube coating on the skirts and bearings too. Last time I looked into cost it was looking like a couple hundred dollars to do all this, but that was a few years ago.
Not real practical for someone who doesn't want to take the engine apart though...but if you have a spare engine to build or have it apart anyway it's good stuff.
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