A bar roll can be a nice way to add some capacity to the front. It can be as simple as a stuff sack and two straps. A couple pieces of pvc pipe can be used to get the roll away from the bar a bit. Just thread the straps through it. It has worked well for me.

Old Man Mountain is known for their racks on suspension forks, but I think they have a solution for carbon without bosses. No experience with them myself, but it might be worth checking them out. Maybe someone else here can verify?