Back in the early 80s, I saw one used. Quite slow and hard to use.
It should be noted that no one uses Japanese typewriters any more. They weren’t commonly used, most things were hand written until reasonably priced word processors because common in the late 80s/early 90s and gradually replaced handwriting.
The first company I worked in in Japan, in 1990, was a translation, documentation and printing company, and part of the work was inputting text from handwritten originals.
Uhmm. No. Japanese is much simpler to type than Chinese.