Sorry, I should have answered your questions. You can camp there. I believe you could get an air charter out of Port Heiden. As for the camp operator, if it is the same guy, he will be helpful, but will try to discourage you. Not that he is concerned about the fishing space, but that he will have to end up helping you. You might want to check the average weather out there in late Sep!!!
If you decide to try it, I and several friends and I have been floating rivers in alaska for 15 years, unguided. I,d be happy to give you some ideas.