A simple work around I can think of.
1.Create an Actor with the variables you can set from your level blueprint.
2.Place the actor in the world and select it.
3.While the actor is selected, create a reference in your level blueprint.
4.Set the variable of actor every time you change the value in level blueprint.
5.Add the reference to where you want to access it. In your case, player pawn.
6.At the BeginPlay of the variable actor, set self reference to player pawn.
Level_Blueprint → BP_Actor.SetVariable()
BP_Actor → GetPawn().SetRef(self)
Player_Pawn → GetRef().GetVariable()