I wore myself out yesterday doing a section of the Mary Jones work that the Bible Society have put together. See here. I only went as far as the Cross Foxes Inn as I had to walk back to collect the car. It's about 10 miles, though I got lost once or twice so took longer. It was a beautiful day. I'll have to do the rest of it some time.
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.