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Geoduck divers attract them so it is possible. Crabs might wreak havoc on your bait though.
There aren't any known spots where you can catch a halibut within casting distance from shore. If there are any, nobody will be saying anything. I've seen and caught them shallow, but it's still a jaunt from shore.No harm trying, there aren't all that many legal access points to chose from. I wouldn't plunk bait, throw something big and keep it moving. Tons of stuff on the bottom in shallows will constantly be working over your bait - flounder, crab, rock fish, sculpin. I've dove all over the place before I had kids and never saw a halibut in PS.