Buddy, all your concerns can be solved by Arousal Exchange,
http://detail.arousal.io/ It's a project with exchange and OTC and realized 'zero confirmation' when transferring BTC/ETH between exchange and OTC. The ICO will be started from Dec.12th, the website will be updated at Dec.12th as well. Join their telegram for more information.
https://t.me/arousalex 'Zero confirmation'? How can they achieve that. If that's possible that's really a improve.