You can access the videos of the messages given at the recent Banner of Truth Conference in the USA here at the Banner website. On one you can see my fellow elder Dr Robert Strivens singing a hymn and introducing Dr Mark Jones (who makes controversial remarks about Dr Joel Beeke ;-)).
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.