Hi there,
If you are ok shooting totally manual flash, then sync one flash off the camera and have a photo-cell linked to the pc socket of the other flash - this will be triggered by the flash form the first gun. Not many trailing cords this way! I think that Metz still produce/sell a unit, they may even have some options for two-headed flash bar. Manfrotto has a wide range of camera/flash/lighting supports including flexible arms (not cheap) that are the bees knees.