First let me clarify if you misunderstood, ...
I understood OK. I'm presuming that you send the mono accompaniment to one ear and the PA and the click track to the other ear, so the audience don't hear it.
My initial reaction was like Matt's ... transfer to a DAW and pan/mix the tracks as you wish before rendering, but I think you may need a dedicated click track in BiaB for that ... it's easy enough to do, but it is an extra task. BiaB normally does the count-n on the drum track, so one may have to turn that off first.
I just held back a little wondering if there were any other, possibly better, options.
BTW, when importing XML and/or MIDI, sometimes one has to set an offset to get the notes/chords to start in the correct bar. When you do the import, you get a dialog box with the tracks and channels, and the offset tweaks are in the bottom right-hand corner. It's easy enough when you try it.