There is actually already such a system in windows 10 called P2P windows updates, by default your computer can become a "hub" to update computers on your LAN, and also other computers over the internet to unload microsofts servers (you can also setup your own computer to download from microsoft + local PC + internet PC), i have setup one computer that does windows updates in my local network and is set to use P2P only for local computers, and all my others windows 10 computers on my network are set with metered connection (fake metered) so that they seek updates only from Local forbidding them to download from internet.

To complete the op answer, best is not to rely on regedit for updates, but you can use different method.

- Disabling windows update service
- Using a 3rd party tool to do your updates (like portableupdates)
- Use GPO's to disable/tweak windows updates
- Using GPO's combo with a WSUS
- Using a master computer that distribute by LAN all updates like i stated in the beginning of post

GPO's are reserved for windows pro version but im pretty sure most miners out here use windows pro.