I shall do some research when it comes to replacement time and see if other options are better.
Look to get your tires just before you go over the Canadian border, or have them waiting for you and install booked in a major city like Whitehorse in the Yukon, or equivalent in AK.
In Whitehorse we met a V-Strom with this rear sprocket. He could buy new sprockets and chain, but was told 2 weeks before they could put it on for him (so we helped him in the motel carpark).
Have heard similar stories re tires / tyres.
Re choice of tyres, there are many threads on this forum, so I won't give you advice here, other than to say you will need good 90/10 or 80/20 tyres or even 60/40 for AK. Even if you aren't planning to tackle dirt roads, be prepared for long, and I mean 40 mile / 70 km long patches of roadworks. We have over 150 km of torn up, muddy road one day, and 50 kms of dust on other days.
If you are coming through Victoria, BC I know a place that will spoon them on and service your V for a good price.