Sounds like a brilliant plan! One of my colleagues has just taken a year of unpaid leave, bought a Toyota Landcruiser and is planning to drive around the world with her family.
If you are planning on selling the car in Denmark then I assume that you try to keep it on local plates?
I am not sure about Denmark but in Germany to buy a car you must have a local address. So it is not possible for a Brit to buy a German car unless you can use somebody else’s address, as you can’t use your UK address.
I am sure that you have done your homework but just wanted to give you a heads up.