Need help with editing some code with functions.php

Hello!

I already have the code for a checkbox that I wanted on my checkout page. However, I don’t like the way it looks and functions. I really need it to look and act exactly the same as WooCommerce’s delivery checkbox works (instead of delivery I need it to say Assembly, and on the right side I just need No assembly and Assembly 170€ options.
The way it works now is that you need to click the Assembly checkbox to display it the way I need it.

THIS is what it looks like when it’s not checked (Monta?a).

THIS is what it looks like when it’s checked – I just want to disable the first checkbox, so it looks the way it it when it’s checked.

THIS is what I’m looking for.

This is the code I added to functions.php:

    // Display the custom checkbow field in checkout
add_action( 'woocommerce_review_order_before_order_total', 'fee_installment_checkbox_field', 20 );
function fee_installment_checkbox_field(){
    echo '<tr class="packing-select"><th>';

    woocommerce_form_field( 'installment_fee', array(
        'type'          => 'checkbox',
        'class'         => array('installment-fee form-row-wide'),
        'label'         => __('Monta?a v 14 dneh'),
        'placeholder'   => __(''),
    ), WC()->session->get('installment_fee') ? '1' : '' );

    echo '</th><td>';
}

// jQuery - Ajax script
add_action( 'wp_footer', 'checkout_fee_script' );
function checkout_fee_script() {
    // Only on Checkout
    if( is_checkout() && ! is_wc_endpoint_url() ) :

    if( WC()->session->__isset('installment_fee') )
        WC()->session->__unset('installment_fee')
    ?>
    <script type="text/javascript">
    jQuery( function($){
        if (typeof wc_checkout_params === 'undefined')
            return false;

        $('form.checkout').on('change', 'input[name=installment_fee]', function(){
            var fee = $(this).prop('checked') === true ? '1' : '';

            $.ajax({
                type: 'POST',
                url: wc_checkout_params.ajax_url,
                data: {
                    'action': 'installment_fee',
                    'installment_fee': fee,
                },
                success: function (result) {
                    $('body').trigger('update_checkout');
                },
            });
        });
    });
    </script>
    <?php
    endif;
}

// Get Ajax request and saving to WC session
add_action( 'wp_ajax_installment_fee', 'get_installment_fee' );
add_action( 'wp_ajax_nopriv_installment_fee', 'get_installment_fee' );
function get_installment_fee() {
    if ( isset($_POST['installment_fee']) ) {
        WC()->session->set('installment_fee', ($_POST['installment_fee'] ? true : false) );
    }
    die();
}

// Add a custom calculated fee conditionally
add_action( 'woocommerce_cart_calculate_fees', 'set_installment_fee' );
function set_installment_fee( $cart ){
    if ( is_admin() && ! defined('DOING_AJAX') || ! is_checkout() )
        return;

    if ( did_action('woocommerce_cart_calculate_fees') >= 2 )
        return;

    if ( 1 == WC()->session->get('installment_fee') ) {
        $items_count = WC()->cart->get_cart_contents_count();
        $fee_label   = sprintf( __( "Monta?a" ), '&times;', $items_count );
        $fee_amount  = 170 * $items_count;
        WC()->cart->add_fee( $fee_label, $fee_amount );
    }
}

add_filter( 'woocommerce_form_field' , 'remove_optional_txt_from_installment_checkbox', 10, 4 );
function remove_optional_txt_from_installment_checkbox( $field, $key, $args, $value ) {
    // Only on checkout page for Order notes field
    if( 'installment_fee' === $key && is_checkout() ) {
        $optional = '&nbsp;<span class="optional">(' . esc_html__( 'optional', 'woocommerce' ) . ')</span>';
        $field = str_replace( $optional, '', $field );
    }
    return $field;
}

I really need this to work, so PLEASE help me out here as it’s one of the last things I need on this website.

Kind regards

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