I don't think the JW policy of shunning would go down well in Japan.
I have a Japanese friend (not a JW), and he has explained how one of the strongest 'pillars' of society there is loyalty to family and duty to parents.
It is a very strong and long standing tradition in their culture that grown-up children will physically care for and financially provide for ageing parents, and it would be a deeply shameful to neglect that duty. My friend is astounded and appalled to see that in the west, elderly people are often put into care homes and visited by their offspring once a week or less. He had no choice but to cut back on his working hours as a lecturer in Osaka University when his parents became frail, but did so willingly.
I guess for Japanese JWs, cutting off communication with family members if someone is disfellowshipped would be an even more traumatising and problematic than in western cultures.