I think there's very little risk of issues while you're "technically" in the US as you pass through Hyder to get to the Salmon Glacier, which is in BC. MAP. You'd only be in the US briefly, and there is no border crossing into Hyder and no US authorities to deal with. The 90 or so Hyder residents get their utilities, phone service, groceries, etc. from Stewart, so Hyder seems like it is really part of BC. You do have to go through a border crossing as you re-enter into BC from Hyder. I'd stay in Stewart, which is a cool little town, and the King Edward hotel is a good option. Sounds like your trip is coming together! Speaking of open-ended rides, our planned ride to Alaska in 2018 is going to be sort of like that except we have limited time for the trip. We have a few destinations that we'll hit for sure, including Dawson City, the Kennecott mine, the Alaska highway in one direction and the Cassiar in the other, probably 37A into Stewart and Salmon Glacier again, TOTWH, and the Denali highway. Everything else is optional and we'll take it one day at a time. Even though we live in SoCal we're going to leave and arrive back in Seattle, which will allow us to go up and back in about 20 days. I look forward to following your trip!