I like the inclusion of Option C: Stick with Win10 but harden it. A lot of the news gives the impression that your world is over when 14th hits, not recognising that historically legacy software and hardware is a thing. I know some will just continue using Win10 on their hardware that doesn't support Win11 and are okay with it. But, yeah, your guidance of security measures is a good recommendation.

Option C doesn't mention the Windows 11 LTSC version, which allegedly works on machines that don't support the regular W11, and it doesn't have most of the bloat. It is an enterprise version, but it's possible to obtain it legally. However, after using Windows 11 for many months on my new rig and hating every minute of it, I'm seriously considering Option D (switching to Linux) for my older machine.