New Audi, same license plate?

Hello together, after I have browsed extensively at Google and also here in the forum and even called the local registration office, I am now completely confused about the various statements and hope that I can be helped here.The following scenario: I live in Karlsruhe, have an Audi A3 with my desired license plate, which I definitely want to keep and will pay for the car at my Audi dealer in Frankfurt and get a new one at this dealer. and the question, how am I the easiest to do this, to keep my current license plate without having to drive 24x for registration and cancellation from KA to FFM and back? Thanks already for the help and greetings, Shusher