I understand that the solution I seek requires using the scripting function of mp3tag. I am not proficient in using that method. Is there a way to do that with Action or can you guide me on executing the intended function?
As far as I can see the linked post mentions an action of the type "Format value" to copy ARTIST to ALBUMARTIST. No scripting.
In your case I assume instead of ALBUMARTIST use DISPLAY ARTIST.
Please note that "DISPLAY ARTIST" is a user-defined and no standard field.