I think you should just use (9)neko or just 9neko instead as the main tag since it it policy to only have tags that can be typed with an (American) keyboard. (don't tell me about the ⑨ tag, I know about that one)
it appears that a dummy edit is still required as a little push for the change. and surprisingly, i don't see jxh2154 in the tag history of some posts. was the job process killed halfway?