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I've been meaning to learn/run QEMU on my linux box. I assume I don't need to do anything apart from rebuild the image each time I need to do this?

Yes I most likely will tell them to get lost, but if I get an invite from Larry/Sergey I want to be ready.

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You'll probably need to enable some "secure memory mode" in BIOS, e.g. a boot error that you ignore which says something like "KVM disabled by BIOS" needs to be made to go away.

Realistically you want virtualbox, which is closed source and proprietary. qemu will run Linux but I don't think it's accurate and performance enough to run windows, right?

You can run a Windows VM with QEMU, but virt-manager is probably a simpler choice. Qemu is very accurate and performant, but also very flexible and not exactly straightforward to configure. But if your goal is to experiment with virtualization and learn, either one is probably a better choice than VirtualBox.

If security/isolation of unknown not quarantined code, Windows would not be high in my list as a sandbox.

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