You are basicly correct except all the tracks in BIAB can be set to use any one of 16 channels. They can be change BTW in prefs/midi channels.Each track can only use one channel EXCEPT the Melody track & Soloist. They CAN use all 16 channels at once.If you follow my process you will end up with 2 midi tracks on the Melody track:
1. your original melody line that will be re-channeled to channel 1. Which is fine & can be changed.
2. The chords that you created in RB and imported over BIAB on channel 9

Now you'll be sending chords via BIAB and won't need to use RB live.

BTW I've done a similar process with actually more steps in order to use my harmonizer. I did it to 200 songs as I sing on all. In fact I had to do it twice as the first time I didn't care for the results. I had used a guitar RT. Kept getting weird chords. I changed to using a self made, with Pat Marr's template, a piano style playing in root position that I then convert to audio to drive my harmonizer.


John
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"The only Band is a Real Band"
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