Oh, by the way, how to route the re-wire channels to the tracks in Melodyne so I can record & process them?
That's where the MelodyneBridge comes into the picture. To be able get audio in so it can be 'analyzed' and edited, you have to either import it (as you do now) or transfer it from your DAW into Melodyne. That's why Celemony invented their own bridge to bridge the gap in the rewire protocol.
Your gonna have to import audio that you plan to edit or see if you can use MelodyneBridge that handles audio both ways, in and out.