Non Workers - Not Managed by HR user account set up / Roles

Summary: We have been given the requirement to help client save license costs by moving certain workers to 'Not Managed by HR' if they do not need access to the system / require limited access.

When we create a work relationship for 'Not Managed by HR', what should be the user account set up for these workers? Should they have an active user account, with our custom contingent/employee role added? However this means they can access the system and perform transactions, which I did not think was the purpose of this person type.

I have read they can access Oracle Learn, so what user account set up is required for this to work?