I wonder if something like this could follow the spirit of "tag" URIs where you include a temporal component. A semantics of "namespace Foo as established time T."

Any usage of the name in identifiers includes the epoch. Identifiers from several epochs could be concurrently in use. Identifiers rooted in different name epochs are not be comparable.

Out of band networking effects need to establish the meaning of a specific name epoch. The disambiguation doesn't work if the intended consumers are unwilling to learn and distinguish the epoch component of identifiers they care about.

I suppose, at the limit, this is the same as just having everyone add some numeric suffix to names they try to register? But it would be more constrained, e.g. structurally enforce that the digits correspond to some kind of clock metadata which is a witnessed and signed part of the decentralized ledger.