Thanks again, Mica. I think this will be a good searchable thread for the future, it has the right keywords. I vaguely remember this being discussed previously but couldn't find it looking for finish, crack, and repair.
Hollis, just a little forethought if you're going to try this as well: Take out the jack while you're performing the repair, or it you'll likely never have to worry about it coming lose in the future. I was thinking it would be nice to do to ensure a clean repair, but thinking about it from this perspective makes it seem sort of mandatory.
It's off to the store on the way home to find some fresh superglue! I'll probably try a dab somewhere first to see it dry clear, then I'll go for it. Looks like I'll be playing 4-string tonight, as it would probably be best to give the superglue plenty of curing time once repaired before cranking back down on that jack.