I have been to Pelican Cove / town AK several times. Other than it is a bit further out, there is no barrier to going there in a C Dory 22. Jay and Jolene in Hunky Dory were there this summer, as we Brent and Dixie in Discovery.
I am not aware of any Island named Pelican specifically, but there certainly could be one.
If you can get a lat and long, to be sure we are not missing something, and there is an Island, and that this may not be the town of Pelican.
My feeling is that there is no place in SE Alaska that cannot be reached by C Dory. When you start going North of Icy Straits, then that becomes an entirely different story--because of open Pacific Ocean, and the distance between fuel stops.
In our times in Alaska (the equal of 5 summers), We found very few days when we could not travel. If we could not travel, 80 footers were not traveling either. As far as passes, whirl pools, and "Tidal falls", careful planing avoids any issues with these. In fact I navigation far easier in the C Dory than in my Cal 46, which I would take any place in the World. You have to do homework--and know the weather, the obstructions, dangers and currents. These are made easy in today's world, with chart plotters, computers and internet giving all of the information easily available, which had to be dug out of books and tables in the past.
Having said that--Alaska, or anyplace in the PNW is not for a neophyte or novice boater. Any water can be dangerous--and always be prudent.