Yeah, you'll want to keep your domain registered through a different registrar and if CF goes down you can update your DNS Name Servers point from CF to something like AWS Route 53.

This has a few drawbacks like making sure your Route53 configuration is identical to your CF config, ensuring your origin servers can cope with the additional load if CF caching isn't available and the DNS propagation time required for the Name Servers to update.

During the last outage, we were able to get into the CF dashboard and simply disable the proxy which allowed our clients to access our origin servers directly but this time we can't even get into the Dashboard.