Well that's a funny idea, as I haven't tried Second Life I'm not familiar with the tools and how free you are to create in this game. And for the reaching out, selling merchandise through the game thing; I'm not sure how many Alizée fans there are playing this game.
But of course, if I manage to create this wonderful world with Alizée as a theme people who visit it might become interested in finding out who she is. I'm gonna check it out