Is it a problem to read and not write?

Try the KameSame app that searls is developing. While handwriting may not be necessary as pointed above, I was concerned with the fact that WK builds a “one-way” path in your memory (i.e., Japanese > English, or kanji “recognition”). KameSame allows you to do it the other way around and you can match it with WK by level. It actually works much, much better than what I expected. Kudos to searls (and consider supporting the server).