Removing Kana from all Lessons and Reviews is actually very easy, with WK Queue Manipulator. There might already be a script to tick to remove some items.
Example code
wkQueue.on('lesson,review').addFilter(q => q.filter(i => i.subject.subject_category !== `KanaVocabulary`), {subject: true})
It doesn’t auto-mark as correct, though. I have an idea on how to auto-fill the answer, but not to hit Enter; so there might be a better answer in the forum somewhere.
Another part is, whether the numbers of Reviews and Lessons are needed to be faked.