It's a simple matter, at least at the moment, to stop the nagging dead in its tracks with either Never10 or GWX Control Panel. I have little doubt that at least one of those, if not both, will be maintained through the end of official support for Windows 7 at the very least.
I really don't see the point of upgrading to Windows 10 only to rollback or reinstall a prior system image with Windows 7. If you don't want Windows 10 then why bother with it? If you do want Windows 10, and have hardware that's fairly new and likely to still be with you in four years why not just upgrade?
People going to Windows 10 several years after its release will find, as people have with prior releases of Windows, that while the kinks have been worked out that there will not be a cohort of people who easily recall how to tweak this or that to make things as you like them because these sorts of things tend to go into the mists of memory pretty quickly after several years. I have a mighty good memory, but I still have to look up stuff I told people a few months ago because there's so much information being exchanged by those of us who were genuinely early adopters. That gets worse with time, and even more so because there have been some significant changes to certain elements of the Settings since last July, which have seem to have settled down now (which is a plus).
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
Memory is a crazy woman that hoards rags and throws away food.
~ Austin O'Malley