I wouldn't dream to add many, if any, prequel trilogy themes into the OT. For me, that's kinda going too far. Maybe some background filler music, but not out right themes unless they're truly warented... Like...off the top of my head... instead of using the Ewok finale, they used that new age-ey music...but I wonder if something else might have been better...perhaps influeneced by the locations shown or something but thats ok...
If you wanted to see my HP cues, they're here:
Opening
(Includes my new theme)
Next Scene
Next Scene (alternate scoreing)