Understanding Office 365 ProPlus Updates for IT Pros (CDN vs SCCM)

As someone on a team who supports 86,000 computers with non-admin users running hospitals and government office we need Updates to be SCCM pushed, never notify users, never go to the internet to get updates, never reboot or prompt to reboot computers, especially with users logged on and not to try and download up to 172,000,000 MB or 172TB of update data over the Internet swamping the entire network making it unusable. Having computers go to the internet for updates is illogical and expensive once you get past supporting a few hundred machines. No organisations have internet pipes which allow up to 180 TB of data to be downloaded all at the same time. We have SCCM distribution servers per location, where updates are downloaded once, for all machines. They are set to push updates, outside of business hours and Verdiem to wake computers so that SCCM can install them when least impactful to clients when they are not logged on. 
We already have a ticket open with Microsoft because Microsoft's built in Modern Apps are going to the internet downloading 8TB of Data to update OneNote Modern App to 86,000 computers in the middle of the day killing all the WAN and LAN because Microsoft has yet to have an SCCM solution for modern apps  
I think that Math is an important factor for business to consider. Windows 10 with Office 365 does on average about 2GB of updates a month with Office, Modern Apps and Windows Updates. Internet usage is expensive, or it is in Canada. Most organisations cannot afford the Internet usage required for even modern apps. DaveGuenthner