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I own a similar paranoia when I'm using Windows.
Obliviously Windows is the malicious favorite target, and also the most vulnerable for users that never learnt to protect it.
Most of the famous Linux distro offer a very good experience to the end users, even for not techy peoples. My only issue with Linux is the hardware management, and software compatibility.
That's why I'm using Linux as my main OS, for all kind of things, then Windows only for gaming.
As a paranoid user of Windows, both OS are each on a different computer. Xubuntu on laptop, Windows on desktop.
In my head Windows always been itself a virus

I was thinking to get another laptop to manage windows and all thing relevant o bitcoin there, and as you say, the windows for games or design jobs.