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If you want a new device, among current "mainstream" eink devices, only the kindle oasis ($250) and nook glowlight 3 ($120) have physical buttons. I am not familiar enough with the nook to tell if it will support your other requirements.
If you want to try other brands, there are android devices from Onyx and Boyue that have page turn buttons as well as storage expansion slots. They work reasonably well and should be able to support your requirements. You should not have battery life issues with lightweight apps.
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