Really, this seems like kind of a quixotic project. O. Henry's language and imagery, and "humor", are more than a century out of date, and often, like this, put even native speakers of English up against it to explain because much of it is today so obscure. It's going to give ESL learners a lot of stuff that's not going to be very useful. In the 19th Century,Davy Jones was a sort of mythical guardian spirit of the depths of the oceans, the ocean floor was once referred to as "Davy Jones' locker", for reasons also obscure in the 21st century. Davy CROCKETT died at the Alamo. People probably know that today because Disney did a semi-fictional TV miniseries about him in the 1950s and Texas mytholkogizes all its heroes, but again even that is pfairly obscure.
And whatever this means:
Quote: the petrified boom found near Austin, five-cent cotton and the Siamese Democratic platform born in Dallas. ”
it's so out of date that even Setanta is gonna have a hard time figuring it out, and is probably going to have to spend half a dozen hours in his history library to do it. And he's so cantankerous he'd probably only do it out of sheer stubbornness. This is really off-the-wall stuff.