I tried the template approach, where it overrides SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) in the ACharacter derived class, and then bind delegates by calling e.g: PlayerInputComponent->BindAction("Jump", IE_Pressed, this, &ACharacter::Jump);
For some reason this reminded me to include Super::SetupInputComponent(); in my APlayerController::SetupInputComponent and the bindings started working. The editor wouldn’t crash any longer.