Great idea, Palpatine!
I should think FFG could simply print off color copies of the English rules, shrink wrap them with the box, with the rulebook on the back side and including a cover sheet (the part you see through the shrink wrap) that explains what's happening... and I think you'd have a hot product for all the new arrivals to the WoW system.
Yes they could. But if they wanted to put that item on the English-speaking market, they could just ask Nexus for copies with the English booklet inside, as they do for the other sets - no need for any explanation. They just decided that they prefer not to market it. Their choice...