if I had say an $800k-$1m inheritance would I be able to live with minimal or no employment in Lapland?
what sort of access would I have to a social wage?
Depends on what kind of living standard you expect and how good you are at money management. But property prices are very low in rural Northern Sweden and Finland and you would be able to supplement your food budget with fishing and low cost hunting, so yes, its definetly possible. You would be able to buy a small bit of forest too, so you would have wood for a stove.
I am not sure what you mean by a social wage.
Norway is more expensive than the other two countries.