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You may be able to pass the "provider" property to do that.

You can use multiple providers in the same stack. To "move" a lambda without downtime, I would add a 2nd copy with a different provider (still AWS, but in the correct region) and deploy, then remove the 1st copy and deploy. This should "move" it safely.

<https://www.pulumi.com/docs/intro/concepts/programming-model/#providers>