Use SQ to CPH which is 102,800 JPY(approx. 7070 SEK) during your friends's travel period. (Your friends can find more cheaper ticket if they can speak Japanese.)
Then they can purchase *A European airpass or use SAS points to redeem intra-Scandinavia award.
Merit: Getting really large amount of miles (over 20,000 miles r/t)
Demerit: Not much time they can spend in Bergen or in Norway.
*A arpass can be expensive.
It's more likely a MR than a travel.

http://www.etour.co.jp/en/discount_s...E&ticket=ROUND

If your friend can manage the travel date a week later, then the price will decrease to 85,600 JPY (approx. 5890 SEK) for SQ flights.