Could just do it properly..
http://www.peterwhitecycles.com/dymotec.asp

B&M Dymotec S12: Price: $ 315.00, Bottle dynamo ..
Lumotec Oval Plus 12 (12 volt) headlight and bracket Price: $ 82.00,
$ 17.00 spare bulb, is 5 watt (12 volt)
[ its halogen , so an LED substitute is also needing to be a 5W load.]

taillights: $ 68.00, a rack mount, or $ 52.00, rear of mudguard mount..