I wouldn't take carbon frame bike on such a tour. You don't use carbon frame for loaded touring of 3000km in remote areas. Also, I wouldn't take Priority 600 due to Pinion drive and belt. You don't need such a complicated system where maintenance in case of malfunction is impossible on the road in remote areas. Keep it simple, i.e. conventional drive train and use steel frame if possible. That can be fixed anywhere. Use wider tires too.