Having ridden CEC ride (x5) and ridden the route solo a couple times. During CEC, always met self supported cyclists, no problem. You will be a curiosity for many CEC riders and they will have questions about your set up. You could probably "wild camp" on the edge of the group and be fine, probably could also sneak a shower or toilet facilities. The only caution, many CEC riders lack strong cycling skills and as the ride size has grown, riders seem to be more rude. Perhaps CEC is stretching the route's capacity ?