There is limited documentation related to MultiDB Zend module brought in by a vendor. One would assume they are leveraging Zend’s abstract service factory classes to establish multiple db connections. So if you are planning to create your own Zend module, you should be covered. If not -
Suggestion 1:
In the past we have addressed this and other situations at the database level by creating views to local databases. Be warned that designers of this project have chosen to avoid views in standard codebase which is a design handicap.
Suggestion 2:
If you are going to use custom/new scripts to consume Wiley data, use ajax to enhance standard views with minimal changes to standard code.
Best.