Just reading up on the Yunnan province... wow. China is amazing! Yunnan is in a tropical latitude (like all coffee origins) but has a very mild climate because it is so mountainous (like all coffee origins); lots of rainfall (like all coffee origins), and the whole region has an average altitude of just under 2,000m... maybe you see the trend here.
Id never thought of it as a potential origin! And on paper it looks like a ripper. Pretty exciting, I reckon. Look forward to hearing more about it.
Enjoy your Bay.