That's the one that I mentioned above (#7) through Aiyansh. I don't think it's paved from there to highway 37. If it is, that would be a great side trip. Even going further south would be a good idea through at least to the lava field. A few years back the volcano erupted and spewed out enough lava to cover a huge area. It was just 250 or so years ago, so geologically speaking it's pretty recent. Driving through is like being on a different planet. It's truly awe inspiring. I've never been to Gingolyx, so I don't know much about it. It's just recently opened up to vehicular traffic with the new road. I can call some friends that still live in Terrace to ask if it is paved all the way to the cassiar hwy or not.
If that stretch of road is paved, I'd suggest possibly going through Terrace and then up Kalum Lake Rd/Nass highway (hwy 113) from there and then on to hwy 37. There's not a lot on hwy 37 between where 113 joins and Kitwanga, anyway.
The two routes:
Highway 37 turnoff at Kitwanga
And through Terrace
The difference is about 200 km, but it would take a lot longer than two hours just because you'd want to stop at least at the lava field, Gingolyx, and then likely at lookouts over Kalum lake and possibly at Lava lake.
In addition to the Kermode bear (which are pretty rare), one can also see grizzlies and there's always plenty of black bears around, too. Plus, all the other stuff like bald eagles. They're thick as mosquitos in spring, but by summer have mostly gone elsewhere.