In reply to purplemonkeyelephant:
I don't know of anyone renting pulks in Finland but probably someone does. Not quite where you are going but bliss adventures does Arctic survival, dog tours, fat biking, ice climbing out of Pyhä Tunturi in the winter, and Artturi - their main man is likely to know if anyone does.
http://www.blissadventure.fi/en/contact/ and email him, say I suggested you try him. He's a very nice chap and might be able to help or at least point you in the right direction.