Get honey from Queen Nyzerrah before purifying the Wayfort or drink Bimbo Brew. Doing either one a single time will get you the Honey Brained perk which functions as a temporary bimbo personality, doing either again while the perk is still in effect makes it permanent. The honey method has no side effects while Bimbo Brew has a lot so if you just want the personality, go for the former approach.
It's possible another method will be added in the future to allow you to become Bimbochamp sooner.