Attacking America at Pearl Harbor - another not so good idea.
Forgotten weapons is the place to check out weapons
Actually not a terrible idea at all. The Canadians use just such a rifle (I think a Ruger M77 in 30-06) in their jet ejection pack as protection against polar bears.
I suspect the biggest reason it wasn’t pushed is that paratroopers were not a huge part of Japanese doctrine. I do doubt it was as good as a standard Arisaka, but better than an smg.