Hopefully the BB Plugin Standalone will work this way soon as a Live Arranger without Reaper:

See Video: Reaper-BBPlugin-Region-Player.mp4
Download: Reaper-BBPlugin-Region-Player.mp4

This is playing the wma files direct in the BB Plugin.

I updated the script and fixed the ending colors to match the colors in the Instant Track Creator (included), so you use it to set the region colors.
ReaTrak midi chord input to region chord player.zip

I put a marker on every beat and set this is Reaper Seeking settings

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or you can get it to change at end of the measure

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If you already have the Midi Input track, select it before running the Chord Input Player.

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You can use the Instant Track Creator to set the color of the regions:
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https://stash.reaper.fm/u/ReaTrak (Scripts for Biab Reaper)
Working In Biab & Reaper Simultaneously and Instantly