I used to be a EE user too and that's why I created Webinoly.
Most of the things in Webinoly can run in unattended way.
Actually, unattended WP site creation with custom DB data is on the roadmap and it will be realeased in about 2 more weeks.
The first user (username and password) creation is possible but still not on the roadmap. WP-CLI is needed to do this things, I'm considering include wp-cli in Webinoly but still not sure if it worth it.
Let me know if you have more detailed requirements and maybe it could be included in the release scheduled for January.
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