Noel might be making a tutorial as I type, but you can open the saved SGU in RealBand then copy and paste track section or ctrl+alt wil copy the section, ctrl+shift will move the section, you can enable snapping to get it on the beat or disable snap to move manually.

Not sure if I tried expanding the chords by 2 (Edit>SongForm) set the tempo double then using halftime RealTracks and RealDrums to give more chord changes ???