tbh, you have two choices for batteries today: Charge them fast, and they don't last as long, or charge them slow, and they last forever. Heat is the problem the batteries have. If you charge them just fast enough so that in the morning they are full, or at least they never get hot, you are going to do well. The difference that a Scandinavian country imposes is hardly likely to make a difference, due to the phone being in a pocket, your hand, or indoors while charging.
The other idea is to buy a phone with fewer features, but has a long battery life. OnePlus One? Yep, works for me for 2 days at a time, but I charge it each day. I never have an issue where I have to charge it during a single day.