BF
Your time will get you in the door/get you the gig if all else goes well.
After that your time is worthless as not in a Japanese aircraft operating to Japanese procedures and standards.
It is inferior experience and flying.
You will do a full endorsement process to Japanese standard - whatever exactly that is - whether typed or not.
Just the way it is, their trainset, like it/accept it or don't take the ride.
Above post by HD hits nail firmly on head.