AHC: Borneo-sized Lanfang Kingdom ruled by White Rajahs

The Challenge is to have a Kingdom of Lanfang of sorts (as a Constitutional Monarchy rather than a Republic) composed of the entire island of Borneo ruled by the White Rajahs with the majority of the population eventually being dominated by Chinese (as well as other immigrant populations like Thais and Filipinos).

Bonus points if it survives to the present possibly under another name, with the White Rajahs gradually becoming Sinicized (via marriage) yet remaining ardent Anglophiles.
 
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