Use the Kanban Maturity Model to make your Agile initiative desirable through Culture, feasible through Practices, viable through Outcomes and Managed Evolution.
The KMM is build on the belief that desirable outcomes follow practice adoption, that practice adoption can only ever follow culture, and that culture adapts to practiced values. Therefore, all change must be driven first and foremost through adoption of values.
You don’t sell evolutionary change to a revolutionary leader. Generally, you don’t sell evolutionary change to the impatient, and those in a hurry, with a perceived deadline.