Are there any examples of global namespace delegation that should be considered as models?
The closest technical equivalent is in-addr.arpa. That domain provides a reverse mapping from IP address to domain name. It is used as part of the Internet infrastructure operation to help authenticate an IP address and identify the operator associated with an IP address. It is not seen directly by users. The same is true for e164.arpa. It will be for operational infrastructure, rather than for direct access by end users. As with e164.arpa, in-addr.arpa, allocations are hierarchical according to the infrastructure administrative structure. For in-addr.arpa, the hierarchy uses the “CIDR” address allocation hierarchy. For e164.arpa, the hierarchy will be based on the ITU E.164 recommendation.
