Define "successful".
It will always come down to the biggest bang for the buck. Which plane impacts both the MA as well as the scenario/FSO world. The He-111 would make a good addition for B of B stuff etc. Getting folks to fly it with the lousy defensive armament will be a different matter. If I get to fly escort in a 109E it will make nice immersive eye candy for me. But I sure wouldn't want to risk a weekend afternoon in it in a Scenario That's why I'm a Beaufighter junkie. It fills all kinds of roles as a 1940-45 front line bird and would get used in the MA