You'll have to forgive my ignorance on this one, but what is it that makes the USDM harness incompatible with the JDM tail lights, there's nothing magical about our (JDM) ones, just a few standard lamp holders and a typical Ford 'tabs-break-when-you-touch-it' electrical plug?
Edit: Just looked up the differences, it's fairly simple in the grand scheme, I'm amazed no one over there has clones of them for sale, it's about $10 of parts!