During the 2019 Nyutawara Air Base Air Festa the JSDF showed off the Type 81 with some additional art created by エイリゾ that also included some of the specifications. The following year they once more used the same art (If anyone has pictures of this one, that would be great. I kinda lost the link that contained it). As it would be a rather unique historical decal it would be a fun way of adding some additional variation to the Japanese decals.
During displays about 4 different weight numbers were used since it was adopted so it’s not really too useful, even more so considering that this is the JASDF version so either a base model or B model instead of the JGSDF C model we have. And all of that is ignoring the chassis being used.
It’s as historical as IDF insignia’s which also aren’t applied to vehicles. It’s used in an official capacity by the JSDF, If the poster form is an issue then the recently added British “join your country’s army” removes that as well. As that also falls in the same “never applied to a vehicle or unit” category.
It kinda will depend on who owns the copyright but considering that the Kisarazu AH-1S got implemented it means that where there is a will there is a way. That’s up to the devs in the end though.