I can only answer parts of this. I spent a lot of time in the far north of Ontario as a kid - yes, north of Muskoka! Gasp!
- in and around Rouan-Noranda and Larder Lake. Yes, the bugs will be bad. I mean really bad. Honestly, you have never met mosquitos and blackflies anywhere near the density. And blackflies are the little bastards that take a small chunk of skin with them when they bite.
I've been perusing a site that I assume you have found about the James Bay Road region
, and it's pretty interesting. Note that it cautions "The scenery is not spectacular. This is low, flat or gently undulating country. Don't expect the Rocky Mountains. The main natural attraction of this area is the remoteness and silence."
There are long runs without fuel - nearly 400km. I can do that on my Strom, but the road bike may struggle. Our gas cans are your gas cans - they're probably manufactured for a US company in China, shipped through California, then sent via rail or truck to Canadian retailers. So, Rotopax are just fine.
These are truly remote stretches of road you're talking about. You will see lots of trees. And rocks. And rocks and trees. You'll see wildlife - they talk about bears but my bigger concern in that area would be moose and caribou (reindeer). It's a beautiful part of the world, and is in the heart of the Canadian Shield. Then again, you can see that doing a loop of the great lakes, and get the great lakes in to boot - but you won't get the remoteness.
There are posts about the road over on ADV rider if you search.