You would most likely have to wait for them to appear in a events. Most likely the ninjas you have said started to appear in events is due to having a subsequent treasure after. Since China still is on GNW treasure and haven't included the SRs in events (to my knowledge), then I highly doubt they would show up until a new treasure appears.
China has a new treasure last I knew that had Edo Jinchuriki ninjas. Like Edo Fu and Edo Han.
Think there was another but I didn't pay that much attention.
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