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Spent some time fishing around and came up with a working solution based on Carla and jack-keyboard. Here's what I've got:

Run jack-keyboard

In Qtractor
1. Create a MIDI bus named CHORD
2. Create a MIDI track that outputs to CHORD MIDI bus

In Carla
1. Add MIDI Chord plugin to rack
2. Add a instrument plugin (I personally just use Calf Fluidsynth with a basic GM piano)
3. Using the patchbay, connect a2j's CHORD capture to Midi Chord event-in
4. Connect Midi Chord's event-out to the midi_in of jack-keyboard as well as the event-in of your instrument plugin
5. Connect the audio outputs of the instrument appropriately

Now, back in Qtractor, either open piano roll or just select the track and play a single note. The note will be routed through Midi Chord plugin and the result will be heard as well as displayed visually via jack-keyboard

Back inside Carla, click on the plugin's little wrench icon to tweak the plugin on the Parameters tab.

Pretty cool!