An interesting Idea would be to use BTRFS. Since there are so many partitions and all the hassle with LVM, this is not going to be funny (if done for all 28 partitions).
One could make a 14G partition on the SDcard, add it to the BTRFS volume on the internal storage as btrfs-raid1 and voila - BTRFS would be self-healing, even with broken internal flash.
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