I RPed with someone several years ago with Dyslexia, and he was one of my favorite people to write with. He was up front about it, and I really never noticed anything coming up with any of his writing either. I know for him, it just made him work harder and pay attention when he was writing he would look things over again to make sure everything was correct. He was an amazing writer, and I think having the Dyslexia only helped him to be like that. I don't know if I have written with anyone else with Dyslexia, if I have they never told me. But I have no problem writing with anyone who has it, and I prefer you be up front about it. But it really isn't necessary for you to be either.