The other option is "don't do that" and allow people to spam /jp/, a relatively slow board, and kill its core userbase.

a) make a board just for vtubers
b) make a board just for the generals that have clogged /jp/ for the last several years

/jp/ is not a general board. There shouldn't be idol generals and vtuber generals anyway. If /v/ got a /vg/ because of general spam, do that for /jp/ as well to maintain a normal community.

Merry Christmas.