Titan, I MADE an account simply to tell you how amazingly epic your plot alterations here are.
One change I am going to make when I run this, since my PCs already have developed backstories-
Even then, I may have him, on the verge of madness, rant about how the proximity of his and Galdana's counties may mean there was some blood intermingling, and that perhaps he, Adivion, was also descended from the Tyrant.
Clearly, he wasn't, but it is entirely possible, especially as last-ditch effort reasoning.
So thanks for the inspiration!