Ironically, the fact that its bloody difficult to get there by road would be a great reason to increase the sail fleet there. It could then be like the East India Company, sending out ships and getting them back. It would not be too onerous to use this route to boost settlement (people were used to having to stay aboard ship for ever to get anywhere, just read Wolseley's memoirs) and for constant replenishment of ships of the line. The Pacific scientific voyages had to come from the Baltic originally, so it would just be an extension of that.
Its also not inconsequential that the major straits, islands and rivers in this area are all named after admirals and the commanders of naval expeditions.
Best Regards
Grey Wolf
The result will be the EIC writ large. With home and the Tsar literally half a world away they will be on their own and relying on their own resources. The resulting empire will be Russian in name only; in practice it will be very much independent. Oh, they will be careful not to incur the Tsar's wrath, lest he send punitive expeditions after them, but they will pursue their own ends with their own means.
The Russian Empire is fundamentally an autocratic semifeudal land power. The Russian-Pacific empire will be an oligarchic mercantilist maritime power, as different from its parent as a whale from a lion. The only things they have in common will be language and religion, and those will diverge in time as well.
BTW, thanks for recommending Cloud Atlas; a most enjoyable read.