Hello Again!
After no responses, and especially after stumbling upon this eBay guide (
eBay Guides - How to Legally Import Register Nissan Skyline), I have temporarily paused my search for a RHD Supra.
As it turns out, I had done pretty much all the same research covered in this guide and come to the same conclusions. I certainly learned some interesting tidbits from the guide, and rated it up for being concise and informative.
In any case, my authentic RHD Supra dream will have to wait until about 2013. Until then, I'm looking into a variety of US-legal JDM rides in the 1980-1983 model years that meet my needs.
Thanks again, and take care!