Tao Nan, Ai Tong, Rosyth, RGS, St Nic, Kong Hwa, Nan Chiau and Chongfu teaches higher Chinese. Others I dont know.
To add on, Red Swastika and Maris Stella also offers Higher Chinese. I think that completes the list. :)
My kids are in Chongfu school, I'm from Chongfu too