I dont know what device you were refering to cause when I clicked the link I got shopping cart is empty, but Jabra has a 2.5mm headphone jack to Bluetooth adapter for bluetoothless phones maybe something like that would work for you so you could use your bluetooth headsets?
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-D Modifying and Tweaking is a journey, not a destination................................ MKIIa : 60gig - 040103286 - Blue - v2 + PCATS tuner MKIIa : 20gig - 040103260 - Blue - v3a8 + Mark Lord Special Edition Cherry Dock