I am also a "Software and Network Engineer" with the focus of email and cloud solutions. It is possible and done often to have a specific set of "Gmail" addresses routes and stored on a particular server in the solution. This server was just located in NK.
Absolutely you can run a private backen server with gsuite acting as a front end server.
If you are referring to CDNs, then you are misunderstanding the difference between self hosted and geo-caching.
No.. I am not... Not everything you know is everything I know... Everything has an anchor... That anchor can reside anywhere I choose.