Automatic Canonical URL change for all products pages when changing domain?

When switching over to our own domain the process of going in one by one to change (remove the CC domain and save to reflect the desired domain) the canonical URL for each product page is a lot of work - over 500 products to start with for me. It would be a great thing to have the URL's on each page update when the domain is changed. In my case and I am assume others who are changing providers the old site is kept active until the CC store is ready so as to continue web presence and revenue. Can this be implemented?
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