rinigus, thank you for the port!

I recently purchased XZ2 (H8216) with the sole purpose of installing SFOS, and it came pre-loaded with Android 10.

Is there a path to installing SFOS with Android 10? All instructions I see here and on XDA refer to AOSP9 as seed (and Android 10 as a future possibility only if porting happens). Are there any safe instructions on how to downgrade back to Android 9 if that's the requirement?