[joveian]

Removing the network connection might still work? Windows 10 could be installed and activated fully offline (activated via "slui 0x4" command that gives you 9 six digit numbers and tells you to call a number based on your location; after you enter them, you get 8 six digit numbers back to activate).

From another comment it sounds like you might not actually need to join a domain, it will just let you make a local account so that you can join a domain later.

https://news.ycombinator.com/item?id=30390857