There is a lunchtime lecture (12.30-1.30) next Monday at the Evangelical Library in Chiltern Street London, near Baker Street Tube. I am going to be speaking on Daniel Wilson - An introduction to his life. Do come if you can.
The similar phrase 'Worldly Christianity' is one used by Bonhoeffer. 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.