Decrypt My WhatsApp Chat Backup

I have a WhatsApp chat backup file (the usual .crypt format) that I need fully decrypted so I can read the conversations outside the app. Unfortunately, I no longer remember the password and I never saved the 64-digit encryption key. The good news is that I still have complete access to the same WhatsApp account on the same Android phone where the backup was created.

What I will supply:
• The encrypted backup file stored in Google Drive and, if needed, a local copy from the device.
• Temporary access to the phone (USB debugging enabled) so you can extract the decryption key via ADB, root, or any safe method you prefer.

What I expect back:
• The decoded msgstore database in an easily readable format—SQLite, CSV, or even a simple text export is fine—as long as every chat, timestamp, and attachment path is intact and searchable.
• Clear, step-by-step notes of what you did so I can repeat the process if I ever need to.

I’m open to any proven technique, whether you rely on tools like WhatsApp Key/DB Extractor, NanoBackup, or a custom script in Python, Java, or Bash. Security and data integrity matter more to me than speed, so please outline how you’ll keep the data local and private during the work.

If you have verifiable experience decrypting WhatsApp backups without the original key, I’d love to hear your approach and timeline.