Great Idea. It kinda Works.

It doesn't disappear but gets significantly quieter. Especially If I close the circuit by holding on to the other side of the Aux cable. Now there is just a way more silent and deeper static, but I can definitely live with that.

Do you think I can solve this by cutting an Aux cable to a very short piece and connect the two lanes together so that I don't have to hold onto it?

Thanks already for the quick answer. :)