Would you really need more than one front facing sensor? If the computer knows ground speed it should be able to use a simple algorithm to calculate wind speed. Direction would be harder but a 30mph measured wind speed and 20mph bike speed would mean an effective 10mph headwind which might be all that really matters. Of course, maybe an ANT+ helmet mounted sensor would provide more info. Seems it would need to be out of the way of your body though for any accurate recording.