how can I limit who can create incident templates that can be used by all ITIL users

Hello, we are going live next week and I'm being asked to allow a specific user to create template for all ITIL users to have access to and restrict anyone else from creating any templates.   Would this be something I should use a catalog UI script to accomplish and if so, how would I configure it.

Any assistance or direction is greatly appreciated

Thank you in advance,

Heidi