How to transfer American stock between non-Americans? (see details)?

I know someone who is a lifelong resident of Hong Kong. He owns many shares of stock in an American public company. He now wants to transfer those shares to another person. He has been advised that to do so he needs a Medallion signature guarantee to confirm his identity as the current stockholder. The problem... show more I know someone who is a lifelong resident of Hong Kong. He owns many shares of stock in an American public company. He now wants to transfer those shares to another person. He has been advised that to do so he needs a Medallion signature guarantee to confirm his identity as the current stockholder. The problem is, this Medallion concept is unique to the United States and few, if any, banks and brokerages in HK have even heard of it.
This must be a very common situation. What do people in Hong Kong, or any other country outside the US, do in this situation?
Update: Add. info: the shares are held by Computershare, an American entity. To do a transfer they require a Medallion signature guarantee only--not an equivalent. They do not provide it, they require it. He is in HK. Nobody there knows what that is. There may be one bank that does it, but you must be an account holder and... show more Add. info: the shares are held by Computershare, an American entity. To do a transfer they require a Medallion signature guarantee only--not an equivalent. They do not provide it, they require it. He is in HK. Nobody there knows what that is. There may be one bank that does it, but you must be an account holder and he is not. Neither Merill, BofA, nor Schwab (all of which have a presence in HK) do this anymore at all. Any ideas? He cannot possibly be the only HK resident w/American stock!
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