How can a pending worker gain access without SSO

Summary:

We are looking to use journeys for onboarding task for pending workers taking account that we can email to home addresses. Our issue is that we use SSO and therefore in production the login screen is not seen. We do not want to set up AD accounts for pending workers in order to enable SSO for them. How can we provide a login screen for pending workers only whilst continuing to have this disabled for our current employees using SSO.

so we want to avoid having to use this screen for employees as this does not fit with how we operate SSO but want to enable this screen or similar for pending workers to login