Avoid a potential frankenbike and get a standard MTB drivetrain. There's a reason that only Sugino markets a "touring" crankset: there is little practical difference between 44-32-22 and a 46-36-26 when (with an MTB long cage derailleur) you can pair them with a wide variety of 9 speed cassettes ranging from 11-21 to 12-36. Use the former when riding unloaded on asphalt and the latter when loaded on dirt.