Is there any chance that holding Glowing Iron Fragments or if there were a starlight sphere in the room, it could be used in a limited way in place of having a starlight-aura for non traders casting spells like Blur or Regalia when there isn't unobscured starlight or an unobscured bright moon?

"An' I'm learnin' 'ere in London what the ten-year soldier tells; If you've 'eard the East a-callin', you won't never 'eed naught else. No! you won't 'eed nothin' else"