I spoke with a native Japanese speaker and they also confirmed "The Robots' Reckoning" and "Angels We Have Heard on High" are both incorrect. They said context usually matters, but for the first, it's definitely Toys, they weren't so sure about Twilight, but said the meaning comes close. The second one "Angels We Have Heard on High" is absolutely wrong, though, they said there's no way it's that. And that it means something closer to wilderness ending... (This is without even telling them what your translation was.) So, I figure your translation is probably correct with "To The End of the Wilderness".