Disabling the default organization schema

Creating a new organization type (for example called "publisher" like the example found here https://github.com/ckan/ckanext-scheming/blob/master/ckanext/scheming/custom_org_with_address.json) is very straighforward. However, the links for /organization still work, if you just type them in the browser. Is there some way to only allow "publisher" organization types using the extension? Ideally, /organization would return a not found error.

Review the custom organization schema example and the extension's handling of /organization. Determine how the extension can restrict organization types to publisher while preserving that type's links. Done means /organization returns not found and publisher organization routes continue to work.

Written by the indexing model from the issue text.