Driving with my German Car in Denmark

No you can't unless you continue to live in Germany.
It's prohibited to live in Denmark and own and drive in a German registered car. If you get stopped by the police, the fine is twice the danish duty fee including the fine itself (which is pretty expensive).
Denmark is quite strict when it comes to drive in a foreign car.

Hi Prince,

You can work in Denmark 185 days or less within a period of 12 months without having to register in Denmark.

Otherwise, you have to register your car within 30 days. The registration fee depends on the individual car, age, new price, estimated price today and whether is is an electric car, a diesel car or a petrol car. However, you shall expect the registration fee to be high.
https://skat.dk/skat.aspx?oid=2234542

SKAT can give you a binding response on how much the registration fee will amount to. However, the response time is currently 9 weeks.
https://skat.dk/skat.aspx?oid=2236520

You can also make an indicative estimate yourself.
https://skat.dk/skat.aspx?oId=2234530
To do so, you shall know how much a new car will cost today. Search on autoforhandler + car brand
You shall also how much your car is worth today. Search on brugtvognsforhandler + car brand or e.g. use one of these two sites for that:
https://www.bilpriser.dk/https://www.bilbasen.dk/bilvurdering

/Nellie