Insurance and admission in general

Hello guys, this is not just a question that is related to types, but in general. My stepdaughter has now moved to Sindelfingen. Have fun entering my vehicle data for the Omega and my motorcycle into an insurance calculator and fell off the chair!!!! If I register my vehicles in Sindelfingen via my stepdaughter (then holder) and I remain the policyholder, I could save over 300€ in insurance per year. 0€ per year and at the Omega ca 180€ per year (with TK 150€ and discount protection for both vehicles) Now a question: is there any set or regulations that would say this under? If I would drive my vehicles in Berlin with a Böbblinger license plate permanently?