Self decrypting archive. Passphrase and admin decryption key

We have Symantec encryption management environment. We use it to allow users to create encrypted folders and files but with the option of our quality assurance officer being able to decrypt with her key to check users are not break information governance rules.
What we users need to do is create encrypted files and send to a variety of third parties none of which use symantec. we have been using self decrypting archives. However we should have the option to check the contents without needing the passphrase the user used when creating the file.
Is it possible to set a master key (which the QA officer holds) as well as a passphrase (for the external companies)

All users are aware of the checking that takes place.