We have been working on some functionality specific to notes that allows you to use Excel to perform many of these operations (after the drawings is created).
You can easily loop through a stack of drawings, retrieve their notes (from either the model or drawing) and write/append them to native Excel Tables. We have done several automations like this in the past, they are pretty straight forward in most cases.
Once the notes are in an Excel Table - you can easily transform the the notes (e.g. change values, delete, add, etc.) using Excel Power Query and Set the Values back to your target model/drawing (again referencing a table to SET_CREATE the notes)
All of the above can be done in a few commands from within Excel.
Here are the functions we are releasing in Nitro-CELL v11 specific to notes.