Yes, manual setup of your DNS on a geographically and administratively independent secondary name server is available on a per-domain basis as an Assistance Request.
This service is set up manually on purpose. It would be relatively straightforward (if somewhat failure prone) to set it up automatically, but doing so would create a dependency relationship between the offsite name server and the primary one. That doesn't completely eliminate the reliability benefits of having a geographically diverse name server, but it does greatly diminish them, so we don't do it that way. Our goal is for our secondary DNS to be as close as we can make it to having secondary DNS from a completely separate provider.