Largest problem with theorycrafting is, we have little idea on how would SU AI behave faced with Finland.
In HOI3, IF you managed to get enough divisions out, due to bonuses to you get for winter war, Soviet AI would simply refuse to attack you, so it was possible to wait 2 years, till you either get into Axis, or Germany would declare war on you (happened to me on both my Finland games) at which point, you can get LL from UK and US, and some expeditionary troops, with which your capabilities wastly grow, as 80-120 IC LL allows for a tonne of different stuff to be made.
But, IF SU AI would recognise that Finish resources are far too small for prolonged engagement, SU could just rush in, ignore unfavourable loses ratio, and stomp Finland anyway. It is highly doubtfull player will be able to do anything in that case.