no but i have camped at sycamore canyon another 5 miles north on pch and i have ridden out while the family drives out. it's about 50-60 mile ride depending on which route i take. sycamore has showers, i'm pretty sure leo carillo does too. i like the campgrounds at sycamore, being on the non-beach side is nice and protected and lots of trees and to get to the beach you can walk under the highway bridge so you don't have to cross pch (although the traffic's pretty light).
the hiker/biker site is pretty cool at sycamore, slight more secluded that the normal sites. the biggest issue at them is the homeless got themselves some beach cruisers to stay at the sites and alternate back and forth between campgrounds. you might have to share the hiker/biker site with other bike tourist coming down the coast as well.
you might try posting this on the touring forum as well