I am sorry, because you clearly have great attachment to this interpretation of the character, and I believe this take is unlikely to show up in other mediums, and I suspect there will be repeated attempts to retcon this away, or at the very least distance the character from it.
But in the end I just don't buy it as an origin for the world's greatest thief. That's the main thing with me. Selina is the absolute best thief in the world, bar none, and an amazing athlete as well. She's good enough at what she does that I feel she has to have been working at it for all or most of her life. I just don't buy that any significant period in her past was spent as a prostitute, working for a pimp, and not as a thief that's pushing herself to her limits and building up the skills needed to be at the top of her profession. I could just about believe that she posed as a prostitute for a while, working toward some other goal, and maybe learned some things along the way, but that's about as far as it goes.