So you want to slide it off the road while it's new and get that out of the way?
No season tires = NO WAY!
While I can't say how disappointed you will be with the OEM tires, I can say they are light years behind top rated winter tires for the use you have planned.
+1
I know it's a big hit, but get em now or you'll make another excuse next year. I bought my 2017 Subie Forester in Dec. of 2016. Right away I ordered 4 17 inch rims ( my Forester has 18 inch for summer tires, stock ) and 4 Nokian Hakkapeliitta snows. It was a big hit to the budget on top of just purchasing the car, but I knew if I waited I'd just get snows and mount them on the stock rims once the car was year or two old. Having snows mounted on their own rims makes the change over a piece of cake--20 min in your driveway.
That first winter they paid for themselves. I was going up a steep twisty mountain road in a snow storm trying top get to a powder day. It was a wet snow that compacted to slickness on the road. Every vehicle, trucks with 4x4, SUVs of all stripes, cars, anything with "All Season" tires where all over the road spinning out and many of them into the ditch. It was a sh!t show. I was fine and had all the traction I needed, but I was stuck behind the mess. Finally a big opening opened up in the opposite lane, the down mountain lane, and I just went around all the mess. Forester with Hakkis performed like a billy goat up that slippery mountain road.
Another time last winter: my wife and I were headed out to a jazz concert in another town about 20 miles away. We had already paid for the tickets. Just as we were about the leave our house it started snowing heavily. We were concerned, but didn't want to waste the money and I knew we had good tires. On the way there we saw no less than 9 accidents with several off the road in the ditch within a 7 miles from our house. My car kept on trucking and I had plenty of stopping power with the Hakkies. At one point we where behind several cars going slowly as the lead car in the grouping was driving cautiously. All of a sudden, this very new looking Audi 8 that was ahead of us but following the cautious lead car went sideways and humped up in a bit. We stopped just fine behind it because we had good traction. For a moment we were perplexed at what happened. Then the owner of the Audi gets out of his car and approached the front of it with that "oh sh!t" look on his face ( palm to head ). He had rear ended ( slid into ) the cautious car in front of his new Audi 8, probably with "All season" tires. At that point, I turned to my wife and said, screw the concert, there's too many idiots on the road. We wipped around and headed home.