Example of reusing wcorg_login_message() in other contexts

reuse-wcorg-login-message.php

function camptix_require_login_please_login_message( $message ) {
	/** @var $camptix CampTix_Plugin */
	global $camptix;

	$please_login_message = sprintf(
		__( 'Before purchasing your tickets, please <a href="%s">log in to your WordPress.org account</a>*.', 'wordcamporg' ),
		wp_login_url( $camptix->get_tickets_url() )
	);

	$message = str_replace(
		__( 'Please use your <strong>WordPress.org</strong>* account to login.', 'wordcamporg' ),
		$please_login_message,
		wcorg_login_message( '', $camptix->get_tickets_url() )
	);

	return $message;
}
add_filter( 'camptix_require_login_please_login_message',   array( $this, 'camptix_require_login_please_login_message' ) );