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considering the external account will have policies based on the full resource name which won’t be automatically updated by a rebuild of the resource being shared

Disclaimer: I don’t work for Pulumi.

I think the solution here is to turn autonaming off and add `deleteBeforeReplace.`

If the only thing that is changing is the name and not the resource, you could also use <https://www.pulumi.com/docs/intro/concepts/resources/#aliases|alias>.  Here is a blog called <https://www.pulumi.com/blog/cumundi-guest-post/|Refactoring Pulumi Code with `aliases`>