I think it should be possible, but you have to place the leds like a cap model on you headset.One led left, on led on the right an one in the middle on top of your headset.But...... you need to change the dimension of your model at the dimensions tab.And select ofcourse the cap model and not the clip model.
At the homepage of freetrack you see someone who has it.
Maybe that is more comfortable to use