I see that the online journal of London Theological Seminary is up and running. See here. A surefooted and modest start, it features articles by David Green and Basil Howlett and reviews by the Principal, Robert Strivens. Onr for your favourites box I'd say.
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.