If you have a frozen track just how you like it BUT you would rather Direct Input to add your own FX.
This can be done manually by temporally replacing the normal RT folder with the Direct Input RT folder then export the track.
D:\bb\RealTracks\Guitar, Electric, Rhythm RockBritSoulful Ev 085
D:\bb\RealTracks\Direct Input\Guitar, Electric, Rhythm RockBritSoulful Ev 085 Direct Input
Biab should give this as an option simply by changing the RT path name to go either way, normal or direct input.