"We're all good."
OP updated.
Took a few tries, but Ben was true to his word and we got this whole thing worked out. My original TL2 install is now happy again, and hopefully we've (I say that like I'm part of the company, lol) ironed out the issues with the reset tool so that it works for everybody else that has run into similar issues.
Now, if only I could get Stardock to give me Steam keys for all those games I bought on Impulse (which now belongs to the craptacular GameStop).