This will set the hook for woocommerce for mailchimp plugin to output on a different hook than the default.

functions.php

// Replace YOUR_NEW_HOOK_NAME with the correct hook you want to output at, this should be within the form on the checkout still...
// I just needed to move mine from the addresss to somewhere else on the checkout. 

$mailchimp_options = get_option('mailchimp-woocommerce');
if($mailchimp_options && isset($mailchimp_options['mailchimp_checkbox_action'])) {
    $mailchimp_options['mailchimp_checkbox_action'] = 'YOUR_NEW_HOOK_NAME';
    update_option('mailchimp-woocommerce', $mailchimp_options);
}