I called DL's Seoul office, and while she could not officially switch my seat, she put in a request for an exit row seat for me. I guess those aren't open until the day of, maybe? I'll call when I get up the morning of the flight to see if they can do it then.

Then again, depending on the next 1.5 hours I may get a free military escort out of the country, and maybe make it home for Christmas!