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I know this is a ridiculously low tech suggestion, and that it may not work on a tablet, but I use a Q-tip for footnotes on my Sony readers.
In case you don't have them in the US they are 700mg long 3mm diameter hollow plastic tubes with cotton wool on each end, used for minor medical things, and are available from pharmacies. I'm sure there's something similar in the US. They come in boxes of a hundred or so for a few dollars, so if I lose one I just get another.
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