I’d think any answers here will depend on how you’re mixing down the 6 outs + mic before they arrive at the Bose pair. “Classical” + “natural” + “no chorusy wobble” reads to me as reverb enhancement. I don’t know that anything else would meet all of the qualifications. If you want octaves, any kind of wobble might be unsatisfactory.
Since this is the Stompbox forum, I’d suggest the H90, parallel (insert) routing, perhaps with ‘dual’ DualVerbs loaded up. That should give you a nice stereo mix spread with EQ options. Insert or Dual Routing selection-dependent on your mixdown process. If you’re using MIDI, even more possibilities. But I’d at least consider an expression pedal for dynamics.
