Google Glass 3.5mm jack with battery neck strap
I can now confirm this does indeed work. I used a LR1F499K  RESISTOR, METAL , 499K, 0.6W, 1%. Sounds great with my beats headphones and lasts longer than 4 songs ;). Going to chop up the headphones now and make a unit that fits the device. Cheers for the advice guys ! Much appreciated.