Retrofit DAB+ antenna?

Hello, I’m looking for a way to use the original antenna inserted in the front panel for DAB+ reception. At the moment I use a disc adhesive antenna, this works wonderfully only it looks cruel. Just as I found out now sitting at the end of the A-pillar on each side an antenna soft, left FM1 and right FM2. That would have to be the two antenna cables that also arrive at the bottom of the radio. Would it now work, for example, if I had the FM 2 Switch for a DAB+ capable (8t8035225D) and put another cable to the radio? Does the normal radio reception still work, with limitation ? Maybe someone had the same idea and can tell me something about it.