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On the other hand, for maximum code reuse, you can use regular .NET 7, plus .NET IoT Libraries if you need sensors/access to GPIO and so on, plus Avalonia as a GUI, which is also using XAML, but incompatible with UWP.
I think you can try Uno, which is an almost 1:1 implementation of UWP (which was used in 10 IoT Core), but cross-platform: Windows, iOS, Android, WASM, macOS, and Linux. Not sure if your app can use it.
On the other hand, for maximum code reuse, you can use regular .NET 7, plus .NET IoT Libraries if you need sensors/access to GPIO and so on, plus Avalonia as a GUI, which is also using XAML, but incompatible with UWP.