Using Cmdlets doesn't a exist a way to add a new data gateway to an existing cluster. So i can't create an automatization powershell script for that.
We have an automated deployment of VMs + On-premises Data Gateways via Terraform. I'm guessing this is a pretty typical deployment strategy, but without the ability to connect / restore / takeover existing Gateway Clusters we are stuck with manual steps in Power Platform Admin Center and Power Automate to support redeploy.
See also this suggestion.
