That first, hard cover, case looks like it would give the e-ink screen a lot more protection than the soft case.
Try putting a magnetic shunt on the inside of the case where the magnet is (approximately the lower right corner).
Magnetic shunt :: prefer soft iron sheet, but any mild steel (like from a thin, tinned, can) might do.
Does not need to be very big - just tape to inside of cover where magnet is at - experiment until the hall effect sensor doesn't trigger.
Then pretty up the tape job.
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