Apparently I wasn't thinking when I did this, because earlier today I completely glued this lip onto this board. I didn't use screws from behind like I originally thought of doing. I didn't only glue the middle and find a way for the ends to float. Nope, I glued basically the entire piece (all but the very ends to avoid squeeze out). I wasn't thinking about wood movement at all; I just went ahead and glued it.
And now I have a nice cross-grain scenario that will almost certainly split that nice bookmatched walnut at some point in the future. Well, dang it. Ugh.
walnut.jpg