Won’t happen for the reasons JungleSkip said. HHN excels because of its soundstages. EU won’t have anything comparable to the necessary infrastructure to support 10+ houses that won’t necessitate shutting down half the restaurants in the park. Never mind that a sever limitation of HHN at IoA was how heavily themed the lands are. It basically meant zones were forced into looks that fit the established vibe, where the Studios’ fairly generic city-scapes and flat walls could be anything. EU is even MORE themed and sectioned.
The only way HHN happens at EU, is if EU is massive failure at opening and Universal wants to drive traffic.
There's a reason HHN hasn't been in IOA for 15 years.