I tend to save the better road cranksets for road builds. I will also use the larger two rings on MTB cranks, as a thrifty guy road compact, that's what I have on the Katakura right now. I would be tempted to use a cheap riveted steel mtb crankset on that bike given the service, although the rings would be smaller than that road crank. Or even one of those ugly lower end road cranksets with the steel chain rings.