Can this be added to the registration/login page?

I need to add this to the login/registration page.

I want to send all employees to one page where they choose their branch and are redirected to the registration for just that branch. I have it set so once they register for their branch they have access to the main site as well but they need to be registered as a subscriber on the correct branch.

Would it be possible to add this as a feature to the plugin?

https://wordpress.org/plugins/dropdown-multisite-selector/