Create a page for a theme only

Question

So instead of creating a theme for it i ended up using the template_redirect with an if statement to check the url for a certain thing.

function page_redirect() {
    if ($_SERVER['REQUEST_URI'] == $home . '/other-sites')  {
        require(TEMPLATEPATH . '/includes/other-sites.php');
    }
    if ($_SERVER['REQUEST_URI'] == $home . 'login')  {
        require(TEMPLATEPATH . '/includes/login.php');
    }
}
add_action('template_redirect', 'page_redirect');

Simply all this does is check to see if the requested URI is wpsite.com/other-sites or wpsite.com/login and if this is true then load this template instead. Since i am using some WordPress features though in these custom templates i have also made a check for the title since WordPress will return a page not found title.