Hi Norsk-
When you said "NWT", did you mean to include Nunavut - where the Thelon is located - as well? I assume so.
A little more information would help narrow down what are almost an infinite number of possibilities.
Do you prefer tundra, trees, or a mixture?
What kind of boats do you have / intend to use/ rent? Folding canoes (Ally, Pakboat) or hard shell?
Where do you intend to start out from - Yellowknife, Fort Smith, Stony Rapids, Baker Lake? Where will you land in Canada? If your time is limited, you don't want to waste too much time getting to your starting point.
What is your budget, roughly? Northern air charters have gotten much more expensive of late, and the number of carriers that will transport canoes as external loads has shrunk.
Maybe something on the Kazan (or another river in that area), organized through Kasba Lake Lodge would work for you?
https://www.kasba.com/canoe-tripsI'm a terrible fisherman, but even I caught fish on the Kazan.
I don't think hunting, at least legally, will be an option for you, in the summer, as non-residents.
And, as Norwegians, aren't you obligated to follow in the footsteps of Helge Ingstadt, and paddle the Snowdrift?
There is lots of detailed information available at this site, once the choices narrow down a bit.
Happy planning,
jmc