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It would be possible to have the system set the book cover as a screensaver if the option exists on the device to set a screensaver as an image from a file.
The reading app would just need to copy the current cover to the folder you select in the screensaver settings, and clear/replace it when you open a new book. That should cause the eink tablet to bring up the image before going to sleep.
I suppose you might get lucky and find a developer willing to add that function, but it shouldn't be too difficult.
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