Maybe you know Warmachine/Hordes' Steamroller Tournament System. You can choose two armylists, it also can be required to do this. The lists have to come from the same faction and while tournaments every list have to be played at least once. At the last tournement in Budapest, I've seen this system the first time in epic and I liked it soon.

Do you think, that it is worth to include the following text (or somthing similar?) under Point 6.1.1 p 98, NetEA Tournament Pack:

Players can choose to have a second list. All lists have to come from the same Army List.

[X] List(s) Required – Players must bring exactly X army lists and must play each army list at least once during the tournament.