Create a claim form for devise on rails by replicating the forget password form

I have a system in place where people need to claim accounts already set in a database by proving that they own the same email address. Every user in the user database has a password generated by Devise using the friendly token, so that people can still just login via omniauth plugins.

The current method I have planned out is to create a separate version of password#new (from Devise) as the 'claim' form, but I'm not too sure where to go from there. Do I have to create a whole new model? or can I just create a PasswordsController and config routes to go to a new view?