Non-drupal data to Mongo Fieldstorage and Drupal-entity

Hi,
I have the following use case. I have already a non-drupal database holding hunderd thousands of records with: title, body, link to a webpage, extra info.
I would very much like to have the Title, body, link and a extra info field in the MongoDB and NOT in drupal.
This for performance purposes.

I would like to show the mongo fields through http://drupal.org/project/efq_views

How can I get the fields only to Field-storage MongoDB and also be able to have the complete entity maintained (edit, delete, add new one) in Drupal?

Thanks a lot in advance for your reply!
Greetings, Martijn