Delete attachment from posted journal

Hello all!  We have a need to delete an attachment from a posted journal.  Before anyone says it, I know this is not supported in the application as it is a form of business control.  I don't think you can even delete the attachment if you unpost said journal.  We are 100% aware that there is no way to do this from the application.

What we want to know, is if there is some way to do this on the backend.  We really don't like doing this unless we absolutely have to, but this particular attachment has been deemed sensitive data, and unfortunately we didn't come to this conclusion until after the journal was posted.  So we are hoping there are some options.