Your Camano is more than worthy of the trip. Many C-Dorys and Ranger Tugs make the trip and their hulls are less sea-worthy than yours.
I agree that you are fine without the composting toilet. I would spend instead on a good anchor and ground tackle. I would want AIS-B and reliable electronics. A good inventory of spare parts is always good insurance.
Take a look at slowboat.com for some good videos on provisioning and prep. You will also find their flotilla blogs useful.