You seem to have forgotten one allied NATO partner (and founding member), wich share a border both with Sweden, and the Soviet Union, namely Norway. It seems strange and unrealistic that the US would not use Norway as a staging and resupply area for a war in Sweden. It seems strange and unrealistic that Norway would not serve as a staging area for a British enty into the fray. And also that Norwegian soldiers would not be a part of a NATO effort in Sweden. And also, seeing as the bulk of the Norwegian forces would be placed in the northernmost part of that country, where they shared a border with the Soviet Union, I miss some description of what would happen there. An invasion by Soviet forces into northern Norway, to secure the strategically important Norwegian atlantic coast, and the NATO military assets (especially naval) and airports there seems inevitable. So an independent Sapmi full of armed lapps, in an area bound to be full of either Norwegian (with support from the USMC and British royal marines, which have units ear-marked for this) , or soviet forces, seems unlikely.
" The whole art of fencing consists of only two things; to hit, and to not be hit." Moliere.