I found this cool wanikani reverse vocab course on memrise and thought others might be interested. Wanikani Reverse Vocab.
It should be useful because WK quizzes J->E but that’s only half the equation. This provides an SRS method for quizzing E->J for the same vocab words. I also prefer memrise to anki due to ease of setup and how it doesn’t rely on you self-assessing your correctness.
Hope it’s helpful!