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The Command provider is often a good fit for this. Might work for you as well? <https://www.pulumi.com/registry/packages/command/#remote-provisioning-of-an-ec2-instance>

FWIW, EC2 also supports cloud-init via cloud-config in user data

<https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/user-data.html#user-data-cloud-init>

thanks!  You would have thought I would have found this in aws already but no...