Being in that part of Newport again the other day reminded me of the Jools Holland/Louise Marshall song of a few years ago. I took photos and intended to make a video like this one but never got round to it. Holland apparently wrote it after a concert one night in Newport and hearing a couple arguing.
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.