Ok Guys… For over 2 Weeks i got no response…
But a really nice Guy from the Unreal Source Discord (@sp1r1t_d1tch, you are my Hero!!!) gave me the Solution.
Edit:
I made a tutorial covering all the processes and codes:
https://dev.epicgames.com/community/learning/tutorials/KPOD/unreal-engine-commonui-switch-commoninputbasecontrollerdata-at-runtime