Well, if you really need to not have a knot there when you're done for the day and if your cord is long enough ...
* pretend there is a fourth piece of gear;
* when you thread the cord through the pieces, leave the two ends in the vicinity of the imaginary fourth piece;
* tie the power point's knot as shown in the picture.
The two ends are then isolated from any load by the power point's knot. You can tie them together however you like and it does not matter or leave them free. They will never see a load.
P.S. Personally, I just tie the double fishermans and rarely untie it.