Where exactly along the Pacific Coast?
I do not foresee any problems with this. If you are at all worried, you may freshwater dip the crabs for ten minutes which will remove most of the parasites.
Depending on the location, a second issue may be the trace metal concentrations in the crab. There was a report of bioaccumulation in Enteroctopus dofleini a few years ago and they were found to contain hard metals, presumably from its diet of crab (my theory) and also possibly from across the skin. Strange that wild cephalopods are able to withstand certain levels of metals, while in captivity any trace of copper may wipe out the system. Well, not really strange when you think about it...
Greg