If you are stuck at preboot and the ePO Server or Safeboot server no longer exists and you do not have the password, there is no way to recover the system.
Even with the DETech / SafeTech recovery disk, you must authenticate to decrypt the system. There are only 2 methods to authenicate: Password or Recovery file stored on the server
The recovery code you have is linked to a recovery key that would be stored on the server and is unique to the system. Without the server there is no way to use this code to recover the system.
A data recovery specialist may be able to do something if your company wasn't following best practices but this is an expensive proposition that is unlikely to render positive results.