Universal Soft Pour

I have a hard time getting that perfect initial layer of the warmer milk or cream over the bottom layer of chilled iced coffee. It's such a pleasure watching it mix from the layered state to the clouds of Jupiter. Especially if there's ice already in the chilled coffee. And what about using a standard kettle to delicately add the balance of the pour-through water over the grounds? I know there are special kettles with the gooseneck spout for this, but what if you made a spout out of silicon, with a diverter/flattener at the end of the Soft Pour spout and a roll-back, fits-all, universal funnel thingy at the standard kettle end. Or snap it over the spout of the milk or cream carton if you're doing that. Or stock, oil or booze for a pousse café? Snap it onto any spouted vessel and softly and gently pour away.