Leave the ride the same as is except for the sea and oil rig. Change the narration to talk about Nordic culture, stories and do a whole Frozen themed section in place of the oil rig. Then change the trolls to be Frozen trolls. Frozen fits perfect with Norway. They used Norwegian architecture, traditional dress, setting, etc.
The ride already had trolls which are fantasy and a part of the culture.
If you put anything Frozen in that ride at all - even just one Olaf - the lines will triple in length.
Maybe they could do some type intriguing model or display after the ride.
I doubt they will do anything at Norway. A major ride will come eventually elsewhere.