Better safe than sorry because if you get into an accident with a Model 3, you’ll be without your car for weeks to months with bodyshop lead times. If you have the funds, get a set of winter tires and rims from Tesla or if you want to get aftermarket rims there are plenty of vendors on TMC from Tsportline, Get Your Wheels, Signature Wheel or local Vancouver vendor like 1010tires.
With the new ICBC rates and rules in effect as of Sept 1st, by avoiding one accident with proper tires will pay for the wheels/tires and especially the headaches for repairs. I’m a bit biased though, since I have multiple sets of wheels/tires for all my vehicles.
My go to place for Nokian winter tires is Kal Tire in Abbotsford. Got all my winter tires for my previous two Model S’s and my current Model X and 3 from them without many hiccups. Most reputable Vancouver shops should have experience with Teslas by now like Kal Tire, Volco/1010 Tires, and OK Tires...just ask if they have sold and installed any Model 3 wheels/tires and if they know how to jack the car properly.