You might be able to make your own login form that bypasses the wp_login() function. This page https://codex.wordpress.org/Customizing_the_Login_Form , in the “Make a Custom Login” section, might get you started.
There are no hooks that I see in the https://core.trac.wordpress.org/browser/tags/4.8/src/wp-login.php code that you can use to bypass the password field. So creating your own login page, with associated form processing code, might be how this could be done.
There are lots of plugins that have to do with customizing the login form, perhaps one of those has the features you need.
You might be able to use the action login_form to change the ‘action’ part of the login form to code of your choosing (that, perhaps, just ignores the password field checking and just looks up the user).
Your question indicates that you are aware of security risks associated with not verifying logins.
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