Trigger shortcode on the checkout login page

Hi,

I use a plugin for a login / register popup, and can trigger it with a shortcode. When a customer is not logged in and goes to checkout, the standard Woocommerce login form appears. I want to replace this with the popup, but I don’t know exactly how to activate the shortcode.

This is the shortcode:
[xoo_el_action]

This is the code of my woocommerce form-login.php:

defined( 'ABSPATH' ) || exit;

if ( is_user_logged_in() || 'no' === get_option( 'woocommerce_enable_checkout_login_reminder' ) ) {
	return;
}

?>
<div class="woocommerce-form-login-toggle">
	<?php wc_print_notice( apply_filters( 'woocommerce_checkout_login_message', esc_html__( 'Returning customer?', 'woocommerce' ) ) . ' <a href="#" class="showlogin">' . esc_html__( 'Click here to login', 'woocommerce' ) . '</a>', 'notice' ); ?>
</div>
<?php

woocommerce_login_form(
	array(
		'message'  => esc_html__( 'If you have shopped with us before, please enter your details below. If you are a new customer, please proceed to the Billing section.', 'woocommerce' ),
		'redirect' => wc_get_page_permalink( 'checkout' ),
		'hidden'   => true,
	)
);

So i need this to happen:
1. customer goes to checkout
2. if not logged in, trigger popup
3. after login or register, proceed to checkout

can anyone help me get this to work?
Thanks!