If you’re willing to spend like $15-$25, you can get a cheap tablet/pen (I originally bought a set for Osu!) and use the following Chrome plug-in to write in Japanese. https://www.google.com/inputtools/chrome/
I used to write out Kaniwani answers physically and then type them in, but this is obviously much faster. In case anyone has a tablet lying around or are down to buy one, give it a shot if you’d like!