Instead, you should consider exchanging to foreign currencies before departure or bring a payment card that can be used abroad.
Exchanging cash abroad is a commercial business, which is why the problem must be solved commercially. Danmarks Nationalbank is the issuer of banknotes and coins, but the responsibility of the direct citizen- and business-oriented handling of cash rests with the private actors. This is particularly true in international markets where commercial parties manage the exchange and handling of cash.
Danish cash remains legal tender in Denmark.