Again in my quest to achieve 10 posts (this is silly, but I see the point.)
Here's an APK of Launcher3 built from the android-4.4_r1 branch of AOSP. I have no idea if these work on builds that are not the ones they came from, but it works well enough on my build which it's based on.
Landscape acts just like Google Home for icons! There's no way around this outside of code changes somewhere. (Widgets are fine except they won't auto-resize. If you correct them to work in Landscape manually, that seems to stay)