If I recall correctly, there was a way to point your domain to Cloudflare's nameservers, and point your cloudflare account to x10's nameservers. Although it requires you to have your own domain and not x10's.
I’m on free x10 domain. Mine is already setup by the old integration so I’m not sure if it’ll be tampered with but for new people who haven’t done that yet, it may be a mess. Though it seems DA is allowing the user to alter the NS records. They probably had to as it seems there would be no other way I can think of for them to still be able to do it.
I have spoken with one of the other admins about cloudflare, and according to him cloudflare will hopefully be back in the control panel though that is not the first priority right now. He will look into it a bit more once the bigger things are done.