We are a Google Apps shop and Apple has introduced a great profile called a "Google Account" profile. It specifically configures Email, Calendars, Contacts using Google's login and specific communication protocols (e.g. Web-based, not Exchange nor IMAP/POP).

It works for iOS and macOS, and works very nicely to activate new devices with their Google account.

The only requirement of the profile is the user's email address to be defined. I think this means the profile needs to be configured as a provider, exactly as you have done with Mail/VPN/etc. profiles.

Because of this I cannot use a Custom Configuration Profile, therefore I think you have to integrate this natively.

Thanks!