Replace Default Signup Link with FluentForms?

When the user does not yet have an account and accesses the default login page, they have the option to click the link "Don't have an account? Signup."

My question: with the new FluentForms integration, can I create a custom registration form (with additional fields) and replace it in the "Signup" link on the default login page, or will I need to provide a separate page for my users to complete their registration using my custom form?