Set fixed domain name

On plugins/system/route66/route66.php

I have changed
$url = $uri->getScheme() . '://' . $uri->getHost();
to
$url = 'https://fixed-domain-name.com';
We have the site accessible via two different domain names until the new domain has enough SE rankings to remove the old one. The canonical needs always to point to the new domain.

It would be very helpful if there was an option in the global config to be able to choose the current domain:
$url = $uri->getScheme() . '://' . $uri->getHost();
or a fixed domain
$url = 'https://fixed-domain-name.com';

Hopefully this could be implemented in the next version?
Thank you
S :)