I love my Clara, but also think it is too small for PDFs. I understand your specific needs though, so maybe it would work.
As someone else suggested, an Ony Boox may be a better option. The do make a 6 inch model, but a 7.8 inch model from them may be better, and still be pocketable. The Onyx Boox devices are e-ink, but run Android. That may give you more flexibility with respect to organizing documents, among other things.
Phil
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