If you want to render smaller bar sections just highlight the chord sheet.
If you take the song name out you won't get a massive long filename.
BBPiano_Real 1535 Piano, Acoustic, Rhythm PopPowerPushA-B Ev 120_SingleRender_DragDrop.mid
You can use Bulk File Renamer to remove the "_SingleRender_DragDrop" from all.

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To do it in Reaper create a new project and save as style name,
Drag the Batch render Midi (without the 2 bar lead-in) from Biab into Reaper,
Import/Expand to multi track and import tempo map,
Split up any section of track then highlight all those sections,
Then run "Convert active take MIDI to .mid file reference" these will save in project folder.
Don't forget to create Endings and Holds for EZKeys.

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https://stash.reaper.fm/u/ReaTrak (Scripts for Biab Reaper)
Open SGU in Reaper Instantly