No official answer as far as I know. The book states character lv, which is technically racial HD + class lvs. That's how I ran it in my games as well.
Do note that this can allow certain monsters to access maneuvers faster than their cr might otherwise indicate. For example, an elder elemental warblade5 can get a 9th lv maneuver at cr16. Not sure if it is all that game-breaking, but something to bear in mind.
The Shapeshifter Druid ACF might be able to make you look like a hybrid of some sort.
Make a Druid (or use the PH2 variant so you don't even have to stay in long) for the shapeshifting and then go warblade.