Passing parameters from a user defined workspace to a DM process and Business Rule

When creating a dashboard in the default workspace you are able to pass dashboard parameter values to the data management sequence through the parameter section of the execution script:

You can also use an Input Value parameter and create an extender process to populate the Input Value and then retrieve that value for a DM sequence or BR.

However, when using user defined workspaces, I have only been able to successfully pass parameter values from a dashboard using a literal value (process on combo box executes a rule to populate a literal value with the most recent user selection, literal value is read by DM and BR processes).

The issue with this literal value process is that the value is left at the value from the last execution of combo box selection so it requires the user to change the value to some other value, then reset the value to ensure the literal value has a valid stored value.

Additionally, this process if being used by multiple users, may cause confusion if two users are changing combo boxes thus resetting literal values without knowing that the other users is changing the value.

Is there no other way to reference user defined workspace parameter values like in the argument selections in the Server Task settings?

I have seen some instances where the workspace ID can be referenced, however I don't see an examples of using some type of similar format for parameters (e.g. WorkspaceID.|!SomeParameter!|).