That might works but due to the dumping, this will dramatically decrease price of BCC?
If your intention is to try and dump at an optimal price, just transfer your BTC to ViaBTC.com and dump now. If you don't want to keep your coins on an exchange, due to security concerns, (what just happened to BCE-e customers is a prime example. Though there is a long history of people losing their coins from keeping them on an exchange) then you are probably not going to get an optimal price. It's up to you what you want to do. You can transfer all, some or none of your of your BTC to VIABTC now. (If it is possible. I heard it may be difficult for people to get verified on ViaBTC in a timely manner.)