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I think BuddyPress just uses the standard WP login page so https://codex.wordpress.org/Customizing_the_Login_Form has info on customising or even replacing the page.
On one of my sites I created a completely new page following this guide, https://themetrust.com/build-custom-wordpress-login-page/
It should be simple enough to create a custom page that disables the login button unless the checkbox is selected.