I have more experience than most in grizzly country, even have a grizzly rug from an Alaska hunt. For safety and comforts sake I would not hunt heavily infested grizzly country solo. I hunted SW MT for 6 years straight with two week hunts for about 12 weeks total in the backcountry. Someone in our party saw grizzlies every year except one. Some years multiple sighting and close encounters. Had a few grizz closer than desired but no maulings and one 'mock' charge. One night a grizzly had to be scared away from the tent. In my experience, grizzlies are not scared of pretty much anything, are big, bold and toothy.
Elk hunting was good. At least partially because two legged predators are scared of grizzlies..lol. I would certainly go back with a buddy. Even though a buddy doesn't guarantee safety, it helps for the same reason elk travel in herds, more eyes and ears.
There are plenty of good areas in MT with few if any grizz. I would concentrate on those if solo. I don't award 'man points' to folks that brag they are not cautious of grizzlies bears, they are just stupid, ignorant or both. On the other hand I don't necessarily think it is a foolhardy suicide mission to hunt grizzly country solo, its just not for me. One of the things to think about is how effective are you going to be hunting in Grizz country? Are you going to be super cautious, never hike at night and leave and get to prime hunting areas well within daylight and approach from the open? If you do all the above your odds of being successful will plummet, you would be better off hunting a non-grizz area and actually utilize prime time to hunt elk.