You have created an OS image that is hardened per your organization’s security standards and...

Grant users the compuce.imageUser role in their own projects.

Grant users the compuce.imageUser role in the OS image project.

Store the image in every project that is spun up in your organization.

Set up an image access organization policy constraint, and list the security team managed project in the projects allow list.

Remove VM instance creation permission from users of the projects, and only allow you and your team to create VM instances.