I was asked to respond but can not add much that hasn't already been said . We probably encounter more bears in town than in the mountains or on the ice. But either way, everything that has been said already will work,-- or not.
Grizzly defending cubs or food sources need to be avoided. All things being equal bear spray is your best line of defense, but we have used, Flares ( on ice or in winter so as to not start a forest fire ) Bangs, Fence, 12 gauge when in town or from sled, with bean bags, rubber bullets, whistle crackers, type stuff. If not hunting, sing, whistle, talk, make noise, plus everything you mentioned in your opening post
I do not know anyone who encounters more bears each year than Salmonchaser. He encounters them every day for several months each year and sometimes several of them a day. The op might want to pm him and ask him for advise.