Seems like a really nice endeavour you’re setting up there.
A few notes on the technical aspect of it.
How are you doing the text analysis of the subs? Are you directly comparing it to your current WK kanji and vocab? There’s sofware to do that (unnamed japanese text analysis tool), in case you are doing it some other way. You can even compare to your current vocab and get the difference calculated and made into a list .
About that, unless you’re absolutely fixed on the idea of doing it over the manga version, I think using something like Subs2SRS and Voracious could provide with even a more direct way to go through the film, with the extra advantage of having a direct way to do dictionary look ups while watching.
I’m setting up a similar proyect to go over the films of my favorite japanese director… subs were the most limiting part, but after that is all clear skies … 