The API docs provide a user_create feature through the hosting API here, but this only appears to be available to approved web hosting providers.
I have looked into the Terraform Cloudflare provider, the Ansible Cloudflare role, and the Cloudflare API documentation (using the python API), but the only available API feature appears to be adding an existing user to an account.
Is it possible to create a user account if you are not an approved web hosting provider?