This is the only choice that matters. You are a pessimist by rejecting the only logical choice beforehand.
Don't bother with dual boot, people lack the discipline to NOT boot Windows (or OSX).
Aren't you being a little pessimistic yourself as well? I understand that getting people to stop using Windows is an uphill battle, but I'd think more people would be open to a dual boot set up than having two different devices for different purposes.
(Edit: Maybe we should be promoting the use of Raspberry Pis instead lol)Either way, while I completely agree that people shouldn't be using Windows for crypto (or anything else you could do with Linux really), I wouldn't go as far as saying it's insecure. It's certainly
much less secure, but I don't expect a person who knows what they're doing to have any issues with it. Awareness is so much more important for security because no OS will protect you from everything. The info that LoyceV provided would probably help more users than simply saying "Don't use Windows!", for one.
Of course
But
1.5 billion people use Windows for anything. If we could wipe out that insecure OS that would be great, but I'm trying to be realistic here: it's not going to happen.
The funny thing is, if everyone started using Linux instead and it got all the attention from bad actors that Windows does, users would probably just as vulnerable even with Linux's fundamentally stronger security. People do a lot of stupid shit for free stuff and/or whatever else they want, and no OS can really address that lol.
Ideal operating systems do not exist, and the romantic halo around Linux often disappears when you try to make him friends with your computer hardware. If you are not a bearded admin in a sweater, but an ordinary user, migrating to Linux may not be an easy task.
I've found that things have gotten a lot better on this end in recent years. Even then, most people only really have basic stuff anyway, and people with the more technical hardware tend to be more technical themselves.