What is the correct way to free an interface behind an OleVariant?

I am trying to find a safe/deterministic way to release an interface which is encapsulated in an OleVariant.

AFAICS Delphi releases interface references at the end of a procedure, but in my case I have to do it earlier, because I have to shut down COM.

procedure Test;
var
  LLibrary: OleVariant;
begin
  CoInitialize(nil);
  try
    LLibrary := Null;
    try
      LLibrary := CreateOleObject(LibraryName);
    finally
      LLibrary := Unassigned; // <-- I would like to release the interface here
    end;
  finally
    CoUninitialize; // <-- Shutdown of COM
  end;
end; // <-- The compiler releases the interface here

I though of putting the OleVariant in an extra class instance that I can free before I call CoUninitialize.

procedure Test;
var
  Container: TLibraryContainer; // Holds the OleVariant
begin
  CoInitialize(nil);
  try
    Container := TLibraryContainer.Create;
    try
      {...}
    finally
      Container.Free;
    end;
  finally
    CoUninitialize;
  end;
end;

Is this solution safe or is there a better solution I have overlooked?