For a 7 years old version of BBox, this is a bit of a challenge!
My best bet for you (this far) is go with the =CLAY_GB.STY style, which you should hopefully still have, and build on that.
Tip: Make the bass held for the first round of verse(s) until the chorus, also consider muting the drums for the same section until the last bar before the first chorus. Finally, make the bass "Force to simple" if you feel it gets too busy for its own good, and you just might have something