Here's some food for thought:

Let the Chameleon switch martial disciplines with his aptitude focus. He knows all maneuvers of the level he can initiate of a single discipline. Maybe at level 12 or so, give him 2 and eventually 3 disciplines at once, but cap him at half initiator level. This means that he can have Time Stands Still OR War Master's Charge OR Tornado Throw, but he can't TSS/Raging Mongoose, then drop his 2 kukri he was Stormguard Warrioring the crap out of someone with and pull out his greatsword and use a Feral Death Blow, Then toss the BBEG all over the map with Tornado Throw.