I hope the Drum Riffs and UserTrack riffs are put in before next year.
If not here a few options:

In Realband you have more control but it takes so much longer, if it was made to work like Reaper it would be INSTANT.
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Having the sfz sample sets now for RealDrums this should work well:
RealDrum Solos, Rolls
If you just generate up DRUMSOLJ.STY export the midi drum file and import it to a Utility track in the Biab with RealDrums, set a section where you want a solo by enabling Playable Track then copy and paste the notes in from the midi drum solo that is on the Utility track, you can solo the Util track to find the riff you like.

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Biab Drums in Reaper will give full editing control
https://forum.cockos.com/showthread.php?t=260677
https://www.dropbox.com/s/4mu71bmk1d2a8hf/Reaper-Biab-Drums-GUI.mp4?dl=0

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Biab Track Injector
https://forum.cockos.com/showthread.php?t=264293
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=716019&page=all
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=717674#Post717674
Drums Video: https://www.dropbox.com/s/rj3xsgdacivjjis/Reaper-Biab-Track-Injector-05.mp4?dl=0