Keep in mind that the equipment system basically makes it so you can have your new tank hit the front-lines a few days after the tech is researched and put into production. In older versions you had to wait until you could build a new unit or upgrade a full unit.
Not entirely true. If you watch the last WWW you can see Daniel researching the Tiger II but commenting on the fact that he researched it too late in order for it to be effective in the last WWW and the remainder of the war. He remarked that he could at best only fit one division with these tanks in time. So I see what you are trying to say but it still takes some time before your new tanks are able to be supplied to the frontline thanks to the efficiency modifier of the factories which have to produce the new tanks.
About the OP: Nukes and an airforce are not going to win the war. The only thing in which this combination is good at on its own is destroying potential infrastructure and factories which could have been part of your land. If you want to survive as Sweden i'd suggest strait blocking is much as you can whilst hoping the Soviets can hold of the Germans long enough.When they are on the verge of collapse move in and take Germany, then try to get the weakened Soviets or something like that.