Just post your ideas to crowdsource websites and wait for the aliexpress clone to appear, zero r&d costs, zero dev and manufacturing/qa! That said, Taobao and Ali are so full of bizarre products (transparent rubber domes to be able to type with 5cm long nail extensions), it will be a challenge to stand out
Then make a nice blog post, translate it to Chinese (hell, I'll pay a professional translator for you) and post it on the internet so that someone in Shenzen can try it.