The Rev Philip Hinkey was a missionary, presumably American, in the early 20th century with the American Christian and Missionary Alliance. He is mentioned in the Directory of Protestant Missions in China of 1906, and served alongside Rev. Dr. Robert Alexander Jaffray as a member of the Wuzhou/ Wuchow Bible School in Kwangsi/ Guangxi Province.
In 1927, he helped Jaffray organize a Chinese Revival Bible Study Conference at Canton, capital city of Kwantung (Gungdong) Province, which would continue throughout the 20th century to the present, except during the Japanese occupation (1941-1945).
In 1949 when all missionaries had to leave China, the Wuzhou/ Wuchow Bible School moved to Cheung Chau, to be based on the site of former European House #22, which had previously belonged to Jaffray.
In the 1938 list of Europeans who owned property on Cheung Chau, there is a Mr P Hinkey named as owner of House #28. Due to his connection with Rev Dr Jaffray, I'm thinking this may well have been the Philip Hinkey described above.
Source: Simpson_and_Jaffray