I was thinking about a design similar in essence to this, whereby you would "hook" them onto the top the same way one would hook them on their ear:
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an I based system that has a long enough base __|__ or even just an angled T with a weighted stem to allow the wire that lays on the user's neck to kinda rotate and hang directly under the earphones. The side view would be similar to this:
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Not sure how to hollow out the top of the stem/trunk of it and leave the bottom of it solid whilst attaching the horizontal, cylindrical post for the headphones to hang off of (unless you started out with a hollow rectangle, twisted it, then partially filled it). I was thinking that a nice look for the stem of it would be to make it a twisted rectangular (Think Cayan Tower in Dubai but at an angle) that kinda flattens/thins out as it reaches the cylindrical post.