How exciting! Definitely on the bucket list for me, although I was hoping that someday the Midnattsolgaloppen might go there. Hope the weather is good.
However, Google Maps thinks Trondheim to Leknes is 14h by car with the Bodo ferry, or 17h via Narvik. No wonder legs needed a spin. Enjoy!
Google is not wrong. As for orienteering, it should be possible to do something with mapant but there was not a lot of usable terrain from the bit I saw.