This is a bit ridiculous but it would work. If you install over 300 titles (you could easily do this if you install a bunch of NES VC titles and injects or whatever which would also not take up too much space), titles start to disappear (I honestly can't recall if its the games you installed first or last that disappear), but this just means they're not on your home menu, they are still in your 3DS and you could then launch those titles by launching the FBI, going to the titles option, waiting for the game to pop up there and select and launch it.