Playing it (mostly) straight has my vote, too
Otherwise, in terms of tone, my thoughts went to either the struggling end of the scale or the well-to-do end, perhaps with one or two of us from the opposite side. Depends if we want something more 'dive' or 'court' flavoured, but both provide options for wide impact
For my own reference, common combos for a sextet include:
- All strings, typically two violins, two violas, and two cellos
- Vocalist, two guitars, bass, drummer, and piano*
- Clarinet, horn, and a string quartet
- All vocals
*Transporting a piano could well be amusing, but risks swiftly being less so I suspect
At the moment I'm leaning towards a Halfling fiddler, Dwarf horn-blower, or Goliath on oversized double bass