That’s absolutely hilarious.
But yeah, I think you can get pretty far in any language with a wide vocabulary and basic grammar so vocab is easily the most important thing to learn.
Actually, if you use Anki on the computer, there’s a lot of decks where you type in the answer! [Vocab] WaniKani Expansion Pack v1.0 - 1/13/2016 - Now on Memrise!
This is the one I’m using and it totally has that feature. It’s not as good as WaniKani, as it doesn’t give you any leeway in terms of spelling or variations (you can add those in yourself though) but if you’re diligent with yourself it shouldn’t matter too much.