I've an old plantronics m50 headset that sounds to be just about what you want fits in one ear and sends all sounds over the bluetooth to it, I used to use it for similar purposes even watching videos I'm using full bluetooth headphones these days though.
The one thing that might foil your plan is Apple themselves I do know back when I owned an ipod touch 3rd gen they purposefully left out some bluetooth profiles from the device itself (iphone had them ipod didn't) my guess was to help them sell their earphones and more iphones.
I'm not sure if it's changed now but I think it's unlikely the mic and any controls would work I still think you could use one solely for listening to audio though.
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