Hi eagl,
Glad to have been able to contribute something to your search.
A couple of comments, if I may...
Yasukuni shrine is in Chiyoda ku, (Chiyoda ward) of Tokyo, not Shinkjuku ku. It is not a WWII monument. It is a national shrine built in 1869 where the souls of those killed in all Japanese conflicts are enshrined, not unlike Arlington Cemetery.
I don't understand this sentence: "These groups of drafted folks were the ones to mainly go overseas from Japan to places like Korea, China or even down south like Okinawa." It makes no sense to me. It would be like saying draftees in the US were sent overseas, implying that enlistees were not?