Hi Dan. Good to hear from you.
That's a pretty cool sword. I'm always extremely skeptical of "excavated" swords. Both Mark and I have a number of heavily corroded swords, all of them suspiciously similar.
Your example, however, seems different, and your description of the others is very exciting. I have one example with a lotus bulb pommel and petal/leaf detailing at the ferrule nearly identical to yours. These features seem Thai to me, Ayutthaya period.
Let's see what the others have to say.