RSS Borderlands 3 Switch pak file — custom/obfuscated FPakEntry format?

[GBATEMP]

I'm trying to extract pakchunk14-Switch.pak from Borderlands 3 Ultimate Edition (Switch) for a fan translation project.

Confirmed so far:
- The AES key I have (UUoXdq2EdP+HPkZDcmvn55pGmbgCoKnlfZ434yIXhVU=, base64) is 100% correct — successfully decrypts the mount point and full file list in the index, readable as plain text
- Pak version = 6 (DeleteRecords)
- The footer is shorter than spec — missing the bEncryptedIndex/EncryptionKeyGuid fields that version 6 should normally have

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