If there were Jews in Japan, there can be no doubt whatsoever that the Japanese would have enthusiastically partaken in the Final Solution. That would seem to be a valid assumption, but I don't think it's an historically accurate one.
I'd have to research this but I think there were some Jews in Japan and they were harbored and not liquidated.
But you're absolutely correct about Japs thinking they're the master race of Asians.
I've got a Jap buddy that always says Japs are superior to Chins, Flips and Kim Chis.
He gets all uppity until I remind him how badly America kicked Nip butt and remind him that a Jewish atomic bomb almost incinerated his mother who was in Hiroshima but survived the blast.