Login form selector for different websites

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Login form selector for different websites

Question

I need to create a login form on one site (main) that has a drop-down where users can select the site they want to log into. When the user selects a website, the login form of that site is presented to the user and he is then redirected to a landing page on that site that can only be seen by logged-in users.

Is this possible with regular WordPress or multisite? How can it be done?