Sorry, but "BRZ + Nokian Hakkapeliitta = Snowmobile" is pure bullshit.
You don't specify which of the 4 current types of winter tyres Nokian have on the market (Hakkapeliitta 7,8,9 or R2) you actually have, but I've driven on ALL of them.
They are all very good. The studless R2 is very good on everything except hard ice, the 8 and 9 is very good on everything except wet roads.
All in all, Nokian Hakkapeliitta makes the best winter tires I've tried, and I've tried a lot.
So why bullshit? I'm in my 6th Norwegian winter driving a GT86. And it's OK.
BUT, its's not more than OK. The light weight, RWD and low ride height makes the GT86 way below average of cars sold in Norway in recent years, in winter navigability.
I have no problem letting people drive my car, but not in winter. Norwegians are used to cars that are a lot easier to drive in winter, so I'm afraid they'll have nasty accidents if they drive my car.
So snowmobile? Nope. Not at all.
I'm guessing you haven't driven something like a Subaru Outback in serious winter conditions. That is a very good car for winter navigability, although boring and ugly the rest of the year.
And I take for granted you have never ridden on a snowmobile.
So congrats on buying a cool car and for choosing good tires for it.
- But if it gets really slippery, please drive carefully on public roads. Very, very carefully.