Accidentally wrote an ISO to an encrypted 5TB drive… Help?

So, I did a thing - accidentally selected my 5TB external NTFS hard drive (encrypted with VeraCrypt) as the target for writing an ISO. The moment I noticed that "Impression" had switched the drive letter, I immediately killed the process. But yeah… damage done.

Now, the situation:

• Currently shows up as:
  • 6 MB FAT
  • 4.3 GB
  • 2 TB unallocated
  • 2.6TB unallocated
• The VeraCrypt volume obviously no longer mounts.
• Drive was somewhat crucial - lots of structured data I’d really prefer to recover with the original file system intact.

I know chances are slim, especially with encrypted volumes, but has anyone had luck recovering from something like this? I’m open to commercial recovery tools or command-line wizardry. Would love to hear from anyone who’s been down this road.

Any thoughts or recommendations?