This is purely an academic question.

An SSD with controller brand X, some NAND-chips brand Y. The drive is fully encrypted by the user (no hardware encryption). Controller X dies because of some reason, but NAND-chips are intact. An exactly the same drive is bought (same X, same Y, same everything) as a donor.

Recovery options (four separate, not consequtive):

1. Chip off.
2. Replace Dead X with Donor X.
3. Move NAND-Y to donor drive (same locations).
4. Fill Donor with some data, perform chip off recovery to get the structure.

Option 1 is out of the deal due to the full drive encryption, but what about 2-4? Are any of these feasible for an encrypted scenario?

Isn't the encryption key tied to the controller in some way?

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A backup a day keeps DR away.

Let's assume it isn't, just for the sake of an argument.