Since Xcode cannot be run on Windows, and you do not want to virtualize, you have one option, you can let someone build for you. For NativeScript, you can get unprecedented experience with the Telerik platform: http://www.telerik.com/platform#overview
Of course, there are many other cloud services (such as CloudBees, MacinCloud, MacBuildServer, Unity Cloud and many others). However, for NativeScript, I highly recommend taking a look at the Telerik platform, as it is a tool created just for that.
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