I read Zadie Smith's short story The embassy of Cambodia today. It appeared in The New Yorker a little while back. I've not read any Zadie Smith but I am aware of her as a local girl and wouldn't mind reading NW. This one is interesting enough and strikes some useful notes that transcend the Willesden setting. Worth a read.
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.