UncleFester:

What about this idea - start with the BIAB file in the key that you want the music to sound in. (say C)
Input the Bb chords into the "Bar Lyrics Layer" right above the chords in the regular grid.
Now when you press Play, both sets of chords appear, always in sync.

If you need to have dual displays (if that's what the 2nd laptop is for), you can use the other laptop
as a "monitor" for the main one. There are lots of youtube videos that explain how to accomplish that.
Indeed, if that is the intent, you could also use a small (say 13") TV, and just HDMI the signal to it.

Good luck!
LLOYD S