I agree. This seems fairly doable. I've had vics and mbuna together many times. Yeah, you'll deal with aggression issues, but that's the case with most vics and most mbuna.
People tend to say, "oh, no, you can't do this and you can't do that." Realistically, my one rule of thumb with old world cichlids is to pack them in. If you put 6 fish in a 55, you'll constantly deal with harassed fish. Put 15-20 in there, and you're golden. Just plan on going overboard with filtration and water changes.