Generate the song with the RealDrums and copy that track to a Utility Track.
Set the Drums to Force Midi Drums and generate and edit the first 19 bar and freeze the track. Mute or delete bars 19 to the end of the track.
Mute or delete the first 19 bars of the Utility track that have the RealDrums

Drums track should play the edited midi for bars 1-19 and Utility Track Drums 19- end of song. I tested using to the first 8 bars but the process will work with any measure.

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Drums Edit.jpg (252.35 KB, 78 downloads)

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.