[db-wg] Chicken and egg in regards to inverse

We have a customer with an inverse object (in-addr.arpa) whereby the 3 nameservers listed are long extinct and need to  be replaced. So the customer went to Cloudflare and paid to use their 2 nameservers (specifically harley.ns.cloudflare.com and  teagan.ns.cloudflare.com). Yet, when I go to RIPE to update their inverse record I get many standard errors that the nameservers do not exist yet to serve this inverse domain.  The customer tried to create the  zone in cloudflare, but  CF asks them to change the DNS in the RIPE object, but to change the RIPE object they need first to have an active DNS zone…. So what is one to do in such a case? Thanks, Hank