Hi jonaf,
my tire catalog lists the maximum load of a 100/90-19 front as 200kg and the maximum load of a 110/90-18 rear as 225kg
This would make the total maximum load 425kg
Take away the 210kg bike weight and there's 215kg left for rider, passenger and luggage.
You could ask your registration authority about what particular weight they actually need?
Hopefully the Norwegian authorities don't display the same combination of tyranny and ignorance so often seen in North American DMVs.