Here is the web site for the charter boat:
Naknek/Bandito Charters
The owner, Kurt, said that the boat starts getting a little cramped with more than 10 rebreather divers, but he will take up to 12. There are links to accommodations on the site. He asked that if you book with one of the links that you mention you are diving off the Naknek. He mentioned that this is high season so if you want to stay on the island you should make a reservation now.
The boat was booked for the 9th, so is not available. I would like to do at least one dive on Saturday, either on the mainland or on the island. Lime Kiln point would be a good spot. Maybe Burrows Pass in Anacortes might make sense, but I have not looked at predictions for either site yet.
We will be getting back to Friday Harbor at about 6pm. I will probably stay on the Island Saturday night so I don't have to sweat the ferry boat ride to get there Sunday morning.