I can get the new audio section but when the RC midi automatically sends it erases the current track.
The Plugin needs to do it another way so it's not erasing the current midi, maybe insert a new track ?
You can write the notes directly into the current item erasing any in the time selection first, but this won't allow tweaking where riffs end/start.
If you don't set it to Send RealCharts with Audio then you can just drag the new RC section in and edit it into the current midi then "Glue" all selected midi items on track if need be, I think this is the best option.

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