I was just listening to last weeks bombcast and I had an idea when they were talking about Guitar Hero 5 and The Beatles; Rock Band and how that people who buy a game in either franchise won't necessarily like every song on the disc. So I was thinking a good alternative would be a bundle where you could get all the instruments as well as a code instead of all the songs on the disc allowing you to download 60-70 songs, or however many would be in the game, from their online store. This way people would be able to get all the instruments and then be able to fully customise their track lists to their liking. Or they could just buy the downlaod code if they already have the instruments. Obviously only people with internet connection would be able to use this so it isn't a perfect alternative.
Wear a fake moustache and top-hat on one of the dates and then just go normally on the other that way if one of them says hey I think I saw you with some other girl last nigh , or something similar you can just say no that was someone who looked very like me with a moustache. Works ever time,usually for bank robberies but I'm sure it's success will carry over to this as well.