I recently discovered about LineageOS:

- You can build the Android TV and Android Automotive variants
- You can build the Android emulator and images that supposedly run on QEMU

One result of this is that following their instructions, you could build a vanilla Android TV image that *could* boot on physical x86 hardware (and test if this has better performance than Chromecasts, etc.).

But there's still the issue that streaming services might not like this.