It was while being miserable at Les Miserables that thoughts I've nearly had before came together. It was good to see Paul Gamston at the Carey last week. I'm sure others have noticed the Russell Crowe similarity.
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.