I am also planning a (August) 2017 Alaska trip... though I'm doing it by truck, for ease of camping, and because my wife is coming and we can share driving to make a long push there and back home to save on vacation days.
I'm in the early planning phase now so I wanted to subscribe to see what other ideas are being shared, and also offer my own.
I got a copy of "The Milepost" which is highly touted as the bible for AK trip planning, including routing to AK through Canada. It's 700 pages and granted, has some ads and some BS in it, but overall is highly useful:
Another Strom Trooper, who I don't see having already replied to this thread, did this trip in 2012 and has some good advice in his blog (read it backwards, and if you stay on a page too long sometimes you have to refresh the original link to get the above posts to display, the link often defaults to a page number and gets stuck on that page):
He offers the advice of turning around after you pass Atigun Pass on the Dalton, as the flat tundra north of there is "meh". Someone else on this thread said that, too, so I'm inclined to pay attention to that advice. I would like to get the Arctic Ocean but it seems this is unreasonable unless you have some sort of "in" with the oil companies to pass through. He also makes reference to a motorcycle shop that he was quite impressed with, which is apparently open 24/7 to aid travelers and change tires. I didn't note the info because I won't be on a bike... but might be worth digging into his blog and checking out. You could arrange to have tires there waiting on you.
The route I am leaning towards includes the Sea-to-Sky Hwy, Cassiar, Alcan, Klondike Loop, Top of the World, Dalton, Denali, Hatcher Pass Rd, Tok Cutoff, and Icefields Parkway. I almost routed right past Icefields until I read his blog and realized how close it was, and it's apparently one of the best rides in the world.
To your selection of tires, I have run Shinko 705s exclusively on 3 different Stroms over more than 100,000 miles total. I ride pretty aggressively and l see about 10k-11k usable mileage on fronts and 6k-7k on rears. I end up keeping the fronts on too long just to even out the tire changes (1 front for every 2 rears). I've never had an issue with the Shinko on any sort of road surface; as long as there is something offering support (hard pack, gravel, asphalt) they are fine; in bottomless mud or clay they are poor choice. I would not hesitate to run them on a AK trip given what I've learned about the roads up there.
I'm also going to read that Vespa blg that was linked, I'm thirsty for intel...