Maybe just ask?
(Check back on this post, I'll be adding links as I find them for a while...)
OKCoin Contact Info
https://www.okcoin.cn/tcat-6-601.html
https://www.okcoin.cn/question/userSupport.do
https://twitter.com/OKcoin
Huobi Contact Info
https://www.huobi.com/about/contact_us
https://www.huobi.com/about/manage_team
https://twitter.com/huobicom?lang=en
Allen Scott of Coin Telegraph knows how to get in touch with Huobi management and has interviewed them several times, maybe he would do a referral....after writing an article on the Lisk ICO, maybe?
http://cointelegraph.com/authors/allen_scott
One problem, they don't trade in altcoins...