John:

That all sounds unnecessarily complicated and laborious.

You do know that there is a setting in BIAB that is dedicated to outputting chords to a vocal harmonizer, like the one you are buying). In "Preferences" click the box labelled "OutputCh. and it will be self-explanatory. The default is midi channel 1, but you can tailor the settings to suit your setup.

Check it out when you get your TC-Helicon. I have the Harmony-M (I am a keyboardist), and it works great!

Good luck.
Daisy