My only other suggestion would be to just make a second ringtone just so that you can have ability to highlight more than one track. Their are several ways to make a ringtone:
-From your phone, their is an app called "Ringtone Maker Pro" that I like to use once in a wile, it cost $.99, but they do offer a free version with limited capabilities (but its super easy and quick).
-For Mac or PC, their is a method to making ringtones using just iTunes and renaming an audio track from .mp4 to .mpr (its does require several steps, but it can be achieved).
-From a Mac you have Garageband, its a little more technical, but I like using it.