Then i would suggest create a Java DC and a separate Enterprise Application. So you can deploy your helper all alone and you do not have to deploy them together with the WD DC.
1. Create Java DC and define your packages + classes.
2. Create Public Part of type compilation + type assembly and reference your classes
3. Allow the Entity Forwarding uner tab Permissions
4. Create Enterprise Application DC and set dependency to your Java DC (deploy + runtime).
5. Create Public Part for your Enterprise Application of type compilation and reference your Java DCs compilation.
6. Add runtime dependency of your Enterprise Application to your WD.
Hope this helps.
Regards,
Tobias