I did pretty much just what you did on my 640 a couple of years ago.
The biggest mistake I made was to take pictures and write up a how-to post for this discussion board...
You'd have thought I slept with my mother, for cryin out loud. All the flames and static - not exactly the responses I had hoped for.
Doesn't matter. The NAA tank with an 8N fuel filter and a new longer fuel line works great. No more burnt fingers, lots of advantages you already mentioned.
Doug in east TN