this is unfortunately impossible due to the way the plugin duplicate marking currently works i.e. by processing links when article is rendered for display.
one possible alternative is reworking everything to run during feed update which would remove this limitation but i'm not sure if it's worth it. one of the downsides would be plugin not reacting in real time if you change the similarity threshold, etc.
my rationale for doing it this way was phash checking not being bulletproof so it's better to err on the safe side and work on links only while presenting them to the user anyway, so that they might click on them if they feel the duplicate is flagged incorrectly.