RelationshipOne has a cloud connector that allows you to export all form submissions, or really any activity. I used it, it dumps all fields into one column called rawdata. I used this for a form audit project to identify forms being submitted that were missing key fields. Perhaps that will help you guys out. here is the link. Relationship One AppCloud - SFTP - Bulk Eloqua Activities Exporter
it does require access to an SFTP server for their connector to deliver the results.