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...
And LTC ? Chinese are leader on LTC trading and LTC is an altcoin, the biggest before Ethereum arrival.
True, 99% of all LTC is traded on Chinese exchanges.
If Lisk makes it to Chinese exchanges, it will pass Ethereum on MarketCap... no doubt.
I hate to be the bearer of bad news, but I just finished checking these two sites, okcoin.com and huobi.com (english version) and after seeing their list of coins that they support I found out that both of these sites are only a BTC and LTC show, nothing else. They have not, and never have they added any other coins besides Bitcoin and Litecoin, not even Ethereum is added there, nothing, just Bitcoin and Litecoin, thats it.
For they to add Lisk there is to finally break their BTC and LTC protocol that they have been so dearly holding since forever, they would have to see something of epic monumental about Lisk for they to be so convinced that it is worthwhile to add to these exchanges, maybe with more than $1 million dollars that the Dev has to improve Lisk (at our peril of having a lesser quantity of Lisk holdings) maybe the dev can indeed bring upon that monumental innovation that will leave the whole world in awe and then Lisk will get added to these exchanges.