Solution 7(although its sort of a variation of another solution): You prince a scheme and topdeck your bane card each turn.
Yeah, Prince helps a lot actually. Solution 5 works, just Prince whatever Action card it is(with Highway, maybe) and don't draw any more cards this turn. Similarly, Solution 4 also works, Prince a discard action and Scav.
Solution 8(kind of cheating a little): The Bane card is Masquerade(or really, anything that doesn't lose you your hand also), and your deck is KC/KC/Goons/Bane(or Monument)/Masquerade
Also in this category: Any kind of Pin deck that can both prevent your opponent from ever junking you, and can also guarantee Bane each turn.