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There aren't that many e-readers with microSD support anymore. I think the Boox 7 inch devices to come with that support, and their PDF support is great, like reflow, annotations etc.
They don't come with full Linux ports, but they're based on Android so you can sideload whatever you want.
However, they are a bit more on the pricier side. Maybe you can find a used Boox Page or Boox Go 7" BW.
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