Automate 1Password Account Recovery

You cannot run the op user recovery command using a Service Account, but there is nothing stopping you from creating a "User" with your organization for which you protect the credentials and secret key which acts like a Service Account, in that it's not assigned to a real person. You can automate logging into this user by putting the credentials and secret key in something like SSM Parameter Store (or the equivalent of whatever vendor you choose) and automating logging in and running commands in the terminal.

And no, unfortunately, they have not created CLI to do the "complete recovery" step.