Move to a DAW (maybe Realband since it uses BiaB files/features and you have it already most likely)
Create the intro space with a click (so you can hear the count in to the song).
The 'Insert Bars' feature is common in DAWs and will move everything back in the timeline to create the space.

Then record the intro vocals on a separate track in the new space.

I do not work here, but the benefits are still awesome
Make your sound your own!