Some very solid deals with great sub 24 hour flights flying a mixture of 380's and 777's to Copenhagen via Singapore. The nearest you'll get with a top ranked airline in business class is circa $6500 for peak Euro Summer dates.
Dates are super flexible, have a look using Google Flights - then book with Momondo to save a few extra hundred $.
CPH:
https://www.google.com/flights#flt=SYD.CPH.2019-08-23*CPH.SY…
OSL:
https://www.google.com/flights#flt=SYD.OSL.2019-08-23*OSL.SY…
Do consider buying a ticket ex BKK or another point in SE Asia, if you don't want to spend that much:
eg BKK-OSL:
https://www.google.com/flights#flt=BKK.OSL.2019-08-23*OSL.BK…