Don't want to be the messenger of bad news, but there's no way you're going to get 1 DNS for 1 BTSX.
There were 2bn BTSX issued (not counting those burnt since then) and there's going to be 5bn DNS shares (2bn AGS, 2bn PTS and 1bn dev fund). That means that by giving you 50000BTSX for 50000DNS, you value DNS (even before it has hit the market) at 2.5x the value of Bitshares-X.
Just saying...