I will log this as a feature request. It's quite a niche integration so it might be a little while - if you wanted to write your own middleware it could be achieved right now using the
createDnsThirdPartyProvider API endpoint in Enhance. A URL set here will receive an HTTPS PUT request with the entire zone contents every time a customer updates a zone on your cluster. This is independent of the DNS role on Enhance and does not require you to install any DNS servers.