Sounds like you want to do a transparency scan that relies on previously generated (or default) calibration data so the scanner won’t need to use the calibration window which is blocked by the film.
I don’t have the answer. Just trying to restate your question clearly.
If you don’t get an answer here, try directing your question to Epson’s support staff. I bet there are people at Epson who know what that model can do and how to do it. It may take some persistence to track down someone who knows the answer.
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