Where you have Style 1 in Biab copy those chords to an instance of the BBPlugin with Style 1, uncheck the ending.
Now copy the chords to another instance of the BBPlugin with it set to Style 2, uncheck the count-in, click the arrow on the sync button and set it to start on the style change bar.
If you are actually dragging from Biab it should render the whole song with style changes.