Honestly, between that and the fact that I can't recall the last time Peej actually did anything that couldn't just as easily be accomplished by a monkey, albeit one with superpowers, this actually starts to sound like a really sensible trade. The Power Girl body can match itself up with an incredible intellect and a) begin behaving like somebody who could actually feasibly be in charge of a group like the JSA and b) stop pretending that it's not delighted by boob jokes, and the Peej personality can continue to punch things very forcefully and be easily angered. Everyone wins.