Fair enough. How about this?
Assuming that all the targets are in the Drafts/Manuscript folder and the Notes are all in the Research folder — obviously, adjust as necessary.
What you need to is to have a three pane setup (though you can hide the Binder after the setup is complete).
Left pane: Binder set to show at least the Draft and Research folders — the level of collapse doesn’t matter as once you’ve set it all up you won’t be using the Binder and can hide it.
Middle pane: Fully expanded Outline view of the Drafts folder, set to both ‘Lock Group view mode’ and ‘Lock in Place’
Right pane: 'Full expanded Outline view of the Research folder, again set to both ‘Lock Group view mode’ and ‘Lock in Place’
I.e. something like this:
[attachment=0]Screenshot 2021-04-04 at 12.16.49.jpg[/attachment]
Now you can scroll through the Draft outline on the left till you get to the correct target position, then simply drag the document to be moved from the right hand outline into its new position. All three panes will immediately reflect the new reality.
If you know the name of the target folder, then in the Draft outline just click cmd-F — it turns into a ‘search the outline for titles’ feature.
From a single editor panel select the Drafts folder in the Binder and cmd-3 until it’s showing the outline.
Right click on the header of the outline and choose ‘Lock in Place’ and ‘Lock Group View mode’.
Click on a document. in the Draft outline and then cmd-9 (Expand all documents).
Get rid of any columns you don’t need — especially make sure Synopses aren’t showing.
The outline is now functioning pretty much as a second binder for your targets. Now for the Research ‘sources’ folder.
View > Editor Layout > Split Editor Vertically.
Click inside the new right split to make sure it has the focus, then again on the Research folder in the Binder, and cmd-3 until it’s in outline mode.
Follow steps 2 to 4 but using the right hand outline.
All you have to do now is look through the left hand outline to find the target, then drag the source to it from the right outline.
You don’t needs the binder anymore, so you can hide it if you need to save screen space.
Don’t forget to save this setup as a specific layout so you won’t have to go through it all in future: Window > Layouts > Manage Layouts ( cmd-) ). You can even give your named new layout a shortcut.