There are a pair of 90 minute German dramas that were shown on BBC 4 still available here. The dialogue is in German (with some Latin) and English subtitles. Reflecting modern scholarship the dramas focus not only on Luther but also by way of contrast Thomas Muntzer. Carlstadt also features and Spalatin and Cranach get more of a role. There appears to be no Melanchthon. Under 16s are warned off becasue of some violence. All this helps to narrow down to the essential elements but like so many such dramas eagerness to be relevant means that we get a rather 21st century approach, the main characters not appearing to be from another age at all. The one thing it perhaps does do is to give one an opportunity of entering into the sort of mindset that lived through Reformtion.
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.