I can suggest adding the following scripts:
Nsibidi : writing native to Nigeria (Igbo and other languages).
It's somewhat similar to Chinese in its structure, there are efforts into turning it into standardised writing system:http://nsibiri.blogspot.com/
Sui Syllabary: a syllabary used by Sui people in China, it's considered 'endangered' according to Chinese government.
Dong/Kam characters : based on Hanzi, just like Zhuang sawndip.
Bai syllabary(?) - hanzi as used by Bai people (some write it's a syllabary, unlike Chinese).
Hmong Clothes script: some Hmong people say it's their ancient writing, you can find some youtube videos on it. I am not sure if its trustful, though, very few info on the net.
Adinkra symbols: Similar to Nsibidi, don't know if it's a writing or only a set of symbols.