Hey @LyxieGameDevAcc! Welcome to the forums!
Unfortunately what you’re running into has no fix. “Character” is a more specific form of pawn, so it is allowed far less freedoms. Much of its components cannot be modified without extensive C++ changes, to the point where just using a pawn is EXTREMELY warranted.
Have you tried the Floating Pawn Movement Component? Also check out the Mover 2.0 Plugin!
Hope this helps you decide what to do.