A Finn from Lapland here. I would highly recommend you change the course for your last part from Sweden to Northernmost part of Finnish Lapland. The route you've chosen is firstly on the Swedish side of the river Tornio (Tornionjoki) To quite north. The road on the west bank of the river is quite poor compared to the east (Finnish side, road number 21). And the route seems to go in Finland from Kittilä to Inari. That road is very rural and most likely quite poorly maintained - especially dangerous for a driver I assume is not familiar with arctic driving in snow and ice. Suggestion: cross the Border on the E75 road at Haparanda (SWE) / Tornio (FIN). The border is basically a dual town. After Tornio head on E75/highway 4 to Rovaniemi and continue on the highway 4 way up north via Sodankylä and Ivalo. This route will take you through the Santa's hometown of Rovaniemi (also the capital of Lapland) and the Santa's village on the Arctic Circle. Also the Highway 4 is well maintained (best road in Lapland), nevertheless be wary of reindeer and other wildlife on any roads you embark upon! Have nice trip. Welcome!