Add a new stage ("cloud users") for Co-Management
Add a fourth stage (ConfigMgr - Intune Pilot - Cloud Users - Intune) "Cloud users" in the Co-Management GUI.
Companies might have many users who can be Intune managed without having to be part of the pilot collection or having to wait for the entire organization to move to Intune.
It should probably be a checkbox and point to a collection and not a step on the slider. You might want to use the pilot for testing different types of clients before adding them to the "Cloud Users" collection.