Would these fit well under a motorcycle helmet? Also would it be possible to get a short cable (less than 2ft) for use with a helmet intercom system like a Sena?
I have a pair of M6 Pro IEM's that have a regular length cable and I wear while riding. The method I used was to route the cable underneath my jacket's collar so I have about 14-18" or so on each side. Enough for 1 side of the cable to come up and plug into the Sena's clamp unit, and the IEM's themselves come up to wear from the other side.
I think finding a good way to stow away the excess cable is probably easier than trying to get a custom or specific length cable. Before I got the Sena, I used regular headphones plugged into my phone, and looped the cable through my jacket and kept any excess in the pocket with my phone.