Well, I AM a writer (mag articles & features so far, not had a book published yet, but working on it) and I'd say that as long as you are prepared to brazen out any future potential media stories, then you haven't got too much to worry about. You say you are "reasonably open" about escorting, so this will help if you suddenly found yourself as famous as JK Rowling, in the sense that you can go "yeah I used to be an escort, so what?" *shrugs*.
Personally, I wouldn't be too concerned. Maintain an escort persona - as in DON'T tell your clients that you're a writer (they WILL want to look you up!), and make sure your escort name is different to your writing name. I also wouldn't show your face in any escorting pics or movies, and if you also do camming, wear a wig or change your hairstyle. You may not be ashamed of escorting, but you don't want "VICE PICS!" being unearthed in the future and used against you.
Hopefully you'll get more advice about stuff that I've not thought of yet