Understanding Photos handling of RAW+JPEG pairs

I used Aperture and then switched to Photos when Apple stopped supporting Aperture. I am trying to understand how Photos handles RAW+JPEG pairs. I shoot RAW+JPEG with both of my digital cameras and Apple finally supported the RAW files from my Olympus EM5.3 camera.

But when I want to work with the RAW file and use the menu item to switch the pair to use the RAW file as the original, some apps (in particular RAW Power) which have extensions don't get what the app sees as a RAW file. I contacted the developers of RAW Power (who actually used to work on Apple Aperture) and they said the issue was the way Photos sends the RAW file unless you "Revert to Original" (even if there were no previous adjustments made in Photos) before you tell Photos to use the RAW as an original.

Someone in a photography forum suggested instructing Photos to import the pair as "RAW+JPEG" instead of "JPEG+RAW" (which I don't think is possible) or to import the RAW and JPEG files separately - which seems to work but now there are two image files shown in the Library.

Anyone have any ideas or suggestions? Thanks