A little while ago my eldest son signed up as an extra in Madonna's film WE. We finally got to see his important contribution the other night. It comes in a scene where the Prince of Wales, as he then was, went down to economically harsh Wales and made his famous statement that "Something must be done".
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.