Lots of replies have mentioned the problem of Anglophone workers might present for the Soviets, but for some reason people aren't clocking that this is likely as big or a even bigger problem for anyone trying to make a "White Taiwan." These workers will undoubtedly take part in the Revolution and will have made at least contact with movements in the rest of the Empire. It's almost impossible to imagine that they will sit around being oppressed by the Russian Autocracy all the way till 1917 while their compatriots in Canada and America can, you know, vote. There will have been rebellions and strikes and such, which if we weren't handwaving Russian rule being maintained would probably have succeeded. They will certainly be divided sharply between Socialists and Liberals, but neither will want to be ruled at sabre point by backwards Russian aristocrats. In any situation where Bolshevik power can't project cross the strait, what you probably have is a brief Civil War between pro-Bolshevik and anti-Bolshevik Alaskans with the Canadians and America rushing in to back the later. The British and the US might have a fight over who gets to keep it, or a independent country is set up. White Russian emirges will be gruffly told to get a job.
The Soviets on the other hand, handwaving the likely prospect of Anglo-US Intervention sweeping in, will probably have less problems. Not no problems, but less. This is the early Soviet Federation, it's Internationalist and Westophilic. They are more interested in abolishing cyrillic than in forcing anyone to learn it. If they set themsleves up in Alaska aganist all the odds, the SSR they create there will have English as a offical language, and local Alaskan revolutionaries will be in charge of its government. Whether or not they name it as such, it will be the "first" American Soviet Socialist Republic in North America, and they'll want to use it to advertise the World Revolution to the American and Canadian working class. It will also likely become a refuge for those who want to flee the Red Scare, which will definitely be a hundred times worse. It could very well be that if Stalin does still roll around he ends up purging a lot of Wobblies and DeLeonists.