I'll be interested to see what happens. As I read it just now the aerobatic rating doens't exist yet - as there has never been a JAR equivalent - so it can't be added to a licence, EASA or not. However do let us know what happens as if it works I'll do the same thing!
It does exist - I have it on my EASA CPL. It may not be mandatory to have one yet, but the rating is there.