Can the Vault stanza be specified multiple times, each with a different namespace and create_from_role option?
Is this similar to what you’re looking for?
If so, the answer is yes, but for a price. 
This could be misleading:
namespace(string: "")- Specifies the Vault namespace used by the Vault integration. If non-empty, this namespace will be used on all Vault API calls.
Multiple stanzas meaning multiple Vault instances or multiple stanzes with one Vault instance with namespaces? And if the last option, I guess you’ll need Vault Enterprise, too. Beside Nomad Enterprise.
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