I received an email from SAS on Thursday (long weekend in Japan, so have not been on the corporate email until now) offering to convert my 2300 DKK refund to a voucher, plus an additional 350 DKK value per person on the booking. I will probably take it. It is getting a 15% return on the money I am lending them, probably not the worst interest level I can get these days...

Voucher will be valid for a year from being issued according to the email, I have not yet read the detailed T&C's yet.