In reply to DaveEuroTour: Yes, using, two 10.2mm ropes as half ropes is perfectly safe. But is a little bulky/heavy and faffy through the belay device. But perfectly safe.
Depending on how high the single pitches are you could think of getting a single 60m or 70m half rope and doubling it. The leader tieing in to both ends and the second into the middle. Obviously this only works if the route is under 30m/35m allowing for kinks in the line of the route.
C