FWIW, Swift for Windows is a thing (https://www.swift.org/install/windows/), and there's a new Windows-specific workgroup: https://www.swift.org/blog/announcing-windows-workgroup/

That's progress over where it was a year ago. But the almost complete absence of packages that run on Windows makes the progress made so far more of a curiosity than a usable option--alas. I'd use Swift in a heartbeat if it had even a semblance of a decent ecosystem on Windows.