You may find you get a little chilly in a thin wetsuit on the west coast I use a 6 mm suit out there, but You have to compromise right? Carrying all that gear for that far is a huge undertaking, it’s pretty exposed stretch of coast surf etc and all the things Andrew mentioned, be careful. You will find greenling ling and rockfish, all my diving has been north of where you are heading but there is at least one protected reef in port San Juan near where the trail ends, you might be able to supplement your food supply with your catch if you take your gear, but maybe not too, good luck, let us know how it worked out.