Hey Matthew,
thanks for pointing out the Flight-Option.
I just had a look at the available flights from Oslo and they seem quite cheap to me, especially as its very short term.
Considering the packing hassle (getting a cardboard box in Oslo, packing disassembling plus checking the weight (max. 23kg according to norwegian and I got an oldschool touring bike with 4 panniers so extra luggage would be needed)) I’d now stick to the plan riding north from Bergen, as you also recommended starting in the south in your first comment.