Best way to change morph targets from a widget

I am working on a character customazation screen. I am making a bunch of sliders so that the player can change their characters appearance. Thsese slider are supposed to change
the values for the different morph targets in the head mesh wich is located in PlayerCharacter wich is a pawn.
Right now i am trying to do it via the save file.

From the widget i am trying to call the cutom event reload character that should update the mesh.

I have tried to do the cast many different ways but havent succeded. I am also not sure if this is the best way to do it (not a programmer).
Any help greatly appreciated.