Be advised that most shops with a siping machine won't touch used tires - any little rocks stuck in the tread wreck the cutting blades. There are tools to do it yourself.
I've had it done in the past to Toyo M55's and Goodyear Wrangler MTR's. It will help yes, not equivalent to a dedicated winter tire but definitely noticeable. And no they won't start spitting chunks or wear out prematurely as long as you're mainly on the highway.
You might be able to go a size bigger and gain a bit of ground clearance, better tire selection, bigger contact patch, etc. On my old toyhauler I went from stock 205/75/15 to 225/75/15 with no issues.
When the NDP got in Alberta 2015/16 they came down hard on OHV areas, aligned with well-funded Y2Y and other environmental movements south of the border. It was stressful times, a lot of Crowsnest Pass riding was shut down or restricted and they were working on Bighorn backcountry next before...
Bruderheim requires good power with the deep sand, if I had to ride a 4 stroke it would be a 450. Unless you're just riding the single track and hardpack trails.
https://www.bbc.com/news/live/world-us-canada-65967464
Sonar has picked up noise on 30min intervals so likely they're banging on the walls, horrible situation but hopefully they can locate with a drone sub and connect a cable to pull them up. Ocean bottom is 12,500'