Why don't you convert all ( coin and fiat ) to USD and then convert back to 3 coin ( BTC, LTC, ETH ) which user can withdraw and USDET Token. This is the most fair for everyone.
This is the best if btc-e do it! or at least share the BCH to all users as we had no chance for it because btc-e was down on 25 July. It is not fair some users lose more , and some lose less in current situation!