Thank you for the update! Could confirm that the NonConvert key works.
Other non-US keys such as Convert are still not supported though. But it proves the same approach works if similar issues are reported for those keys later.
Viewing post in Support for JIS Keyboard NotConvert Key
That's great to hear, thank you for letting me know!
I'll likely go through some keyboard layouts at some point in the future to get these all kinds of non-supported keys manually added this way. Since I am unable to test these out myself at the moment, I'll leave it as a on-request thing to add, otherwise we may end up with a bug related to how these keys are read.