Hi..
You have a couple of options. I use Finale (latest version) and Reaper in a similar way often. It would be helpful if you listed what platform, audio interface, internal mixer and release audio drivers in background, also what you've tried.
Have you searched the web for Audio Router, Voicemeeter Banana and or Rewire?
1. Export out of Finale as wave into Reaper.
2. Reassign Finale's output to Reaper's input.
3. Manually change which audio channel both are using.
I hope this gets you on the right track.
G
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