If the wx is good we use Macao, VMMC which is just outside your left window when on left base to rwy 07 L/R in HK. Obviously if the wx is bad in HK it will be bad there too.
Shenzhen ZGSZ is just north of HK which is temporarily unusable as an alternate (until Jan). It across the border in China.
Also in China, farther north is Guangzhou ZGGG. Kaohsiung, RCKH and Taipei are over in Taiwan. Those three are your picks of the pearl river delta area is under the weather.
Hope that helps.