DW, I doubt you will find something better! Hundreds of hours were spent perfecting the unit. If you want to sound just like Fett in real time, get rid of feedback, and add Fett sound effects, I dont think there is an easier way to do it... At least nobody else has figured it out.
Another tip. If you put the speaker inside your armor, try to expose the speaker to free air. That way it wont resonate inside your armor, which will cause more feedback.