Great research Rob,wonder if there are any more photos of Japanese war booty motorcycles,they must have used captured vehicles of all types which fell intact to them,same as the Germans.
It is quite likely there are more pictures but googling in japanese is a bit difficult but I am going to try it.
There must be Japanese enthusiasts as well I assume.
I have no clue to what level Japanese military had the possesion of a camera.
Germans soldiers had much more camera's than even the Allied soldiers!