Have an action to create an ID Number that is unique to the workflow instance

We require a simple unique identifier for each workflow instance to use in a subsequent "Set Instance Name" action, and other communications as a short way of referring to a particular instance.

At the moment the workflow sends data to a sharepoint list and creates an item. It then uses the Sharepoint item ID to create the unique ID, however this is cumbersome.

It would be great if I could use something within NAC that would number off each instance of the workflow.

Screenshot below shows an example - the highlighted number has been created using Sharepoint. Ideal solution would not rely on Sharepoint.