What are magic whiteboards you may ask? Well they’re pretty magic. They comprise of tear off white sheets that are statically charged and can stick to just about any wall.
I grabbed a pack of 5 sheets from Amazon and gave them a try. As you can see they stick to the wall just fine and they are wipeable.
As you can see they are a bit translucent so any walls with busy wallpaper (as above) will shine through. I think over time they simply won’t wipe as well and probably lose their static but so far so good.