There actually are quite a few boutique-bred FG belt-drive bikes out there if you gave searching a try, but they are spendy & no quills among them. Modern bikes with modern drive-trains(?) require modern bits...right?
Trek's District was their Gates-drive SS, was even offered in crabon for a year or two, but I cannot say whether it was able to be made into a fixed bike, and now it has morphed into some kind of geared city bike?
OP - if you are serious about this what is your budget? As you better consider a custom frame. Good luck...
Last edited by IAmSam; 08-03-14 at 12:22 PM.