I have been hiking in Sweden and Norway sometimes.
It can be blowing windy and rainy, sometimes for days on a row, and cold. Though it doesnt have to be like that.
So i don´t think it is a good idea to use a ponchotarp as raingear. You will be misserable. Also to use it together with a bivy as a tarp, everything will become wet with those winds and rain.
So my advise is to take proper a rainjacket and a big tarp, if you are good at pitching in stormy weather, or tent.
As for the musquitos, it can be horrible, making it even impossible to eat, all those insects in the food and under your headmuquitonet. All the time sitting in the smoke of your bushbuddy finally will give you COPD. And a tent is then a very good way to calm your nerves again.
Bushbuddy you can use everywhere, even high in the mountains, there is plenty of wood. When it is to wet, you can buy alcohol in every hut or from people you meet on the trail.
I wish you fun there. Look for the lemmings and don´t drink unfiltered water. Ones we had to ´save´somebody who got stuck in the mountains with sever diarea, 3 days walking from civilisation (except for huts, they are everywhere).