Dynamic Actions are a great tool in Oracle APEX and you can use them very easily in an declarative way. Yet, to set the value of a popup lov dynamically, it is easier to render the link with the java script yourself.
On Apextipps I give an example how to render the link as a simple display-item. It does not need additional page items, dynamic actions or other Apex components. You can easily copy it to other pages of your Oracle APEX application.
You will find my demo site on
(log in with: demo/demo)