Yoast SEO Canonical URL override

functions.php

<?php 

  add_filter('wpseo_canonical', 'wpseo_canonical_domain_replace');
  function wpseo_canonical_domain_replace($url)
  {
      $domain = 'domain_here'; // this can be loaded from option table if you want admin to set it.
      $parsed = parse_url(home_url());
      $current_site_domain = $parsed['host'];
      return str_replace($current_site_domain, $domain, $url);
  }

?>