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That won't be possible. There is no way to use Pulumi to update an existing RDS instance except via the constructor parameters.

You can set the identifier yourself (override Pulumi's random value) and use that in the final snapshot ID. So you can reproduce Pulumi's identifier-generating logic, and use the same random value for both the _identifier_ and _finalSnapshotIdentifier_ args. But you cannot use Pulumi's internally-generated value in both places.

Pulumi uses the _name_ and the RandomId resource (<https://www.pulumi.com/registry/packages/random/api-docs/randomid/>) to generate most id values, you can do that too.